Everything to say about this little mouse has pretty much already been said
349455
Everything to say about this little mouse has pretty much already been said.  It is attractive (matches my Apple keyboard), lightweight and very responsive even on a clear plexiglas surface over light pine wood.  Much cheaper than the Apple mouse and works as well or better.
588300
As I've said at the title, it's a great little mouse. It's the small brother of M310. If you have a bigger hand, you may prefer the big brother.
1462916
I've had this mouse for about 2 weeks now, which isn't really a long enough time in my opinion for a true review but as for first impressions and a bit of use i find this mouse great.

Pros
Lots of buttons
Side buttons feel nice and are responsive
quick change buttons for the dpi are in a good spot so you don't accidentally hit them
LED lights always a nice little touch

Cons
back row of side buttons can be a bit difficult to hit sometimes (7-9)

I don't really have much bad to say about this mouse so far honestly and as far as my experience with it so far shows me i'd recommend it to others.
280983
Mickey, I mean Microsoft has done well with this mouse.  It's small, but not too small so it's portable and easy to use.  Plus it's very responsive and way easier to use than a touch pad. Keep your wireless junk, in some things wired is always better and this mouse is one.
2940404
My old corded mouse was constantly getting its roller ball clogged and became less responsive after years of use, so I switched to this nifty little mouse about a month ago, and I have nothing to say but WOW!  It's very responsive, hasn't died yet even though I constantly forget to charge it in the provided charger, and the only time I though there was something wrong and there was no response from the mouse whatsoever turned out that my computer had frozen.  I do a lot of typing and work on the computer (which is being used by the whole household pretty much all day long, by the way), and the sleek shape does not hinder the work in any way.  I would definitely recommend this great Logitech product to anyone who is looking for a reliable wireless mouse.
4735527
This mouse is a little small, but this flaw can be over looked. Perhaps it is was designed to be on the small side for traveling.  Looks expensive, materials used to make the mouse feel sturdy, and appealing.  Nice design.  Buttons and scrolling control in the middle are quiet, and have a nice cushion.  Easy to use, just plug the USB stick in and the mouse works! All around a great mouse.
819056
After a few weeks of use I have to say this is a pretty darn good mouse. I have rather large hands and it does feel a bit small to me and wish the mouse sat a little higher but it still fits comfortably. So I figured I would try to share a few things that I couldn't really find in other user reviews or reaffirm what has already be noted about the mouse.

Pros:
Fully customizable DPI from 50 DPI to 16400 DPI. You can adjust the DPI by 50 and even edit the x y axis DPI.(Not that I would make them different.)
You can set the scroll speed for the scroll wheel on the mouse.
You can create custom profiles for your different games.
All the buttons and I mean all the buttons are customizable.
You can set buttons to macros, combination keys, even things like copy and paste to locking your computer.
Adjustable weights inside mouse.
Strong and durable cord that is fairly long
The surface of the mouse feels like it was rubberized. ( wierd at first but I like it )
Software is very intuitive and easy to use. I don't understand why people say its confusing it isn't. You don't need to be a techy to really understand it
Lights are fully customizable to any color you want and even the brightness. ( you have a full color wheel to choose from )
You can set the lights to breathe (speed of breathing is customizable) If you don't like the breathing you can turn it off or the lights too for that matter.
Rapid Fire button is fully customizable up to 255 clicks and as low as 2 with as little as 1 ms lapse between clicks.

(I would not advise doing 255 for you will have to wait 255 ms till you want to do anything else. It would be great for FPS though since you can set it to your clip size and click once and unload your whole clip.)

Cons:
Depending on the size of your hand it may or may not be the most comforable though the weights help with comfort.
If your like me and like wireless the fact that its not may be a con.
Scroll wheel is not free spinning.
Rapid fire key take some getting used to. ( I am not really used to it but I don't really use it. )
The 12 buttons on the side are easy to identify but if your not used to it it can take some adjusting. It's fine to me though.

End of the day I cant think of a better deal since compared to like mouses for this price its a amazing deal. Mouse works perfectly.

** Update **
Had it for a few months now and it has survived my two year old. I don't think I will ever use a different mouse. I love it.

** Update ** 06/16/2016
It's been two years since I bought this mouse and it seems to start showing signs of giving out. To be fair it has been moved around a lot but all in all it was well used and taken care of. It seems the optical sensor is starting to die since the mouse sometimes doesnt like to move. I changed surface areas and still get isssue. Still works just may need to get a new one soon. Still recommend.
874896
Pro:
(1) The receiver is so small that you just leave it in the laptop.
(2) All the range you need.
(3) I'm still on the first battery after three months.
(4) Has a physical on-off switch on the underside of the mouse.
(5) Tracks everything I've used, including a fake sheepskin throw on my sofa.

Con:
Not referring just to this mouse, all wireless mice should be bluetooth, and bluetooth should be a standard feature built into all laptops.  No external dongle should be required, not even the very tiny one that comes with this mouse.  I don't understand why the laptop industry has mostly failed to adopt bluetooth.  Licensing fees too high??
1643683
Perfect affordable mouse for someone who just wants something for web browsing and common use. Mouse is Bluetooth with no USB receiver which is very nice to be able to save a port on your computer. Very simple back and forward buttons that are pretty useful. The mouse is pretty small so it can easily fit in a backpack but might not feel comfortable if your hand is big.
2553971
I got the pink version of this mouse as a gift last Christmas, and as someone who's been through several portable USB mice, this is by far my favorite so far. I get compliments on it all the time, which have ranged from "Oh, how cute!" to "Man, that's like the Mercedes Benz of mice."

But looks aside (and this is a gorgeous mouse), I really like it for the following reasons:

1. It's very portable without sacrificing size. The USB plug is tiny, so you can keep it in your laptop constantly if you like. If not, there is a tiny little compartment in the bottom of the mouse you can put it in. I had a ultratiny USB mouse that was about a quarter of the size of this thing, and it just wasn't worth it - way too uncomfortable for daily use. This mouse is about the size of a typical mouse, and fits very comfortably in my hand.

2. Range - I can be across the room controlling my computer if I like. Admittedly, I never have any particular reason to be doing that, but if you need that sort of range, this mouse provides it.

3. Battery life - Just remember to turn the mouse off when you're not using it, and the battery will last practically forever. There's a little switch on the bottom that's very easy to get to. It's so easy to do I just do it by habit now - I hardly have to think about it.

As far as the software goes, it works great out of the box with Windows Vista. Like others have pointed out, the support on Windows 7 isn't the best. I just upgraded to Windows 7, and the response time of the mouse was a bit slow just plugging it in and going with it. This was quickly fixed by downloading the Intellipoint drivers for Windows 7. Now my favorite mouse works just as beautifully as it did before. :) I'd highly recommend this mouse.
4447630
I got this just to use at a mouse, but all the other features just make it even better, If you want a good mouse that feels like it will last a while, go for this one.
2626148
Nothing big here. The mouse works very well, and I've had no problems with it whatsoever. I absolutely love the design as well, both the way it fits my hand and the pink color. A real steal for the price.
1440874
This is my second Logitech wireless nano receiver mouse. The system can't be beat. The receiver is so tiny you forget it is plugged into your USB port. The batteries lasted forever in my previous optical mouse: I am going on 24 months with the same battery and use it at least an hour a day. I don't yet know the life in this laser mouse. The scroll wheel is really nice. You can click it to remove it from the traction to do a super spin to get to the bottom of a long page with a single flick. Very precise scroll wheel and tracking. I found the mouse to be too small. I know it is supposed to be a portable mouse but it is kind of a big for a true portable and really heavy. In other words, it is the same width and height but about an inch too short. I am keeping it because it has enough buttons to do what I need for my Mac.
2280057
Bought this mouse to use with a laptop on the go. I only needed basic finctionality as this was meant to be mostly just used for browsing. The navigational buttons placed near the thumb are great for this.
The color is what drew my attention to this mouse to begin with. I admit that I am not one to usually by tech stuff based on their color choices but I wanted to a mouse that wouldn't get lost in the slew of gray and black mouses in the office space. If you want something unique this is it.
The wireless receiver was absolutely easy to use and was just plug and play on both a Mac and PCs running Windows 7 and Windows 10.
I've been using this for about a week and there is almost no wear on the bottom of the mouse depsite not using a mouse pad. So I'm guessing this will last awhile.
Once again the product comes in the usual sleek TECKNET tan box with a layer of bubble wrap from Amazon as well.
2976024
I just love this little mouse.  It has worked perfect for me for about one year now.  I still have the original battery in it and I use it almost everyday.  I use it in three different computer products and I am constantly changing back and forth between the devices and I am always amazed at how well it has worked.  The feel of the mouse is sleek and modern it works instantly and every time. I would get this mouse.
495399
I was a little worried about such an inexpensive mouse, but it was so cheap that I wasn't that worried. I just needed a basic mouse. I'm really pleased with this. The color options are cool and it looks neat on my desk. I find it responsive, although it was a little stiff at first. I've played a few games with it as well, and I haven't noticed any performance issues at all. Super buy, I might get another one for a backup.
182472
I picked this little guy up at Cost Co. for occasional use with my laptop.

Installation couldn't be more simple (once I got it out of that annoying blister packaging, which seemed practically glued to the top surface of the mouse. Simply plug in the dongle and turn the mouse's power switch on. Two AA batteries are included in the package. The packaging claims 2 years of battery life, and the mouse does feature an "auto-suspend" function, but it also has a physical on/off switch on the base which ought to be used to maximize battery longevity. There's a green LED indicator on the top surface of the mouse, just above the Logitech logo, but mine only comes on when I first flip the power switch, or a bit after I've walked away from it, so it doesn't serve as an immediate reminder to turn the mouse off when I'm finished using the laptop.

The size of the mouse is most certainly demure, but even with my XL hands I don't find this to be a problem, and it's certainly preferable to use vs. the laptop's trackpad. There is a rubberized, ergonomic thumb rest (for right-handers) and the buttons are nicely cupped to accept and retain my index and middle finger (although in my case, not my finger tip, but more like the first finger uppermost finger joint). So yeah, it's small.

The scroll wheel is nice -- resistance is just right, heavy but not too heavy, grippy but not overly textured, and with a number of "soft" dents as it's spun that keep me from spinning too far or too fast, without being burdensome.

I don't know exactly how the laser tracking works. There's no visible red glow like I'm accustom to with most mice, yet the response is always immediate and accurate, and it tracks just fine on a stained wood tabletop surface as well as non-descript vinyl or white paper, without requiring the use of a mousepad.

My one complaint is the interface: it's not bluetooth, which means my laptop's free USB port is tied up with Logitech's proprietary "Unifying" dongle (my Lenovo's only other USB is occupied by a Bluetooth dongle, which I use for tethering with my Blackberry. In my case, a&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Belkin-USB-2-0-4-Port-Ultra-Mini-Hub-F5U407/dp/B000Q8UAWY/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Belkin USB 2.0 4-Port Ultra Mini Hub F5U407</a>&nbsp;is in my bag in the event I need to add a 3rd USB device, such as a card reader.

Very nice addition to any laptop where a mouse would be beneficial.