Best mouse I've ever used.
591028
This is the first roller-ball mouse I've used and I love it so much I bought one for my girlfriend too.
1393730
I just got this mouse as a X-Mas present and am very satisfied. I had a cordless mouse made by Mircosoft and was disappointed that it lagged and did not have a smooth motion. The Logitech MX700 is definitely the best mouse I've ever used. It has a variety of internet functions such as easy scrolling and forward/back paging. The mouse glides along almost any mousing surface, but works especially well on a hard surface. The fluid movement, excellent quality, and multiple functions of this mouse make it almost perfect. My one complaint would be of the price, but I assure you that it is definitely worth it.
577435
This thing is amazing! A year after buying it, I still actively use mine, and stand firmly that it's the best mouse I've ever used. ALL the buttons are programmable (maybe not with the drivers it came with on the disc, I never used that since I didn't have a CD drive in the first place) and the side buttons feel good. The only real issue I have with this mouse is the side buttons are a bit too hard to push than I like, but that problem is on almost all MMO mice I've used. Also the lighting on the mouse is very nice, and the button at the top left is nice, but not as nice as the 2 buttons below the scroll wheel (used normaly to change DPI, I remapped to Alt+Tab and Alt+Esc). Suggested (and got for) several friends, and they love it aswell!

Don' know about the company, and they don't seem to have online presence, so I don' know if they have any customer support, as I never had to deal with them.
2697496
Best mouse I've ever used. Rubber grips at the base of the mouse give me excellent control and feel. Also with the adjustable DPI you will not have to move you hand as far as you normally would. Took me a little time to get the adjustment just right, now it's perfect. The software it has you download is easy to use. Never had issue with it. I've been using it for over 4 months now and have no build issues. Build quality is fantastic.
Overall, its absolutely perfect for FPS games & 3rd person games. If you plan on playing a lot of  RPG's you may want to upgrade to the Naga Chroma which has more button you could program macros to.
1835146
This is the best mouse I have ever used. A great design for my hand and so far it is holding up well. My last mouse lasted less than a year. The LED lights are cool too. The only gripe is the software to adjust pointer speed and stuff is touchy and difficult to get just right.
350166
This wireless mouse is the best one I have ever used. It fits perfectly in my palm. It has an easy turn on button. The cursor flows perfectly on my screen. And the price is fantastic.
3671033
I own and used to own at least a dozen Logitech mice and while they are all great I just have to say that this mouse is the best mouse I have ever used. First wireless mouse that I can play games with. No skips or any other problems. Oh, and the charge seems to last forever. I always forget to put it back in the charger overnight and it never sied on me.
1065845
The best mouse i have ever used. Period. Its so comfortable (as long as you are right handed) and all of the buttons are well sited (the only downer on this front is the scroll wheel middle click is a little too hard). I don't use the DPI switches often, so can't really comment on those.

I've been using it for nigh on 6 years now i reckon, and it still works fine. It has been battered all over (regularly dropped when I move my laptop) and has never broken once. My final point is it also looks really cool!

If you are considering it, just buy it.
55926
By far the best mouse I've ever used. I'm a college student and have a pretty big hand so it fits comfortable in the palm. The settings on the mouse allow you for better control, and there hasn't been a problem with it at all since I've bought it. Love this mouse.
2173680
This is an amazing mouse. As soon as I pulled it out, it was as simple as plug and play. The response felt so smooth and precise, once I start messing with the Steelseries Engine software, it will probably only get better. Best mouse I've ever had.
1676512
I've used the M705 mouse for several years now, at home and at work, and absolutely love it. I can't imagine ever using a different mouse. The marathon wheel is really useful and the battery life is ridiculous. If you aren't using this mouse, you're missing out.
4298901
This is the only mouse I've ever used. I bought it back in 2004 and I'm still using it today. I can tell its beginning to fail, its sitting looser in the USB port and it occasionally loses its connection, but I hope to get another few months out of it.
This thing has taken hundreds of drops without missing a beat. It still functions perfectly aside from the occasional disconnect.
Its sensitivity is just spot on; I get very frustrated using other mouses, because they are overly sensitive, even after going into the control panel.
I only realized today that this thing came with a textured grip, but constant use for almost a decade had eroded it to a smooth finish and the logitech logo is no longer visible.
This is a no nonsense nothing fancy beast of a mouse that will likely outlive any computer you plug it into.
3859907
Probably the best mice I have ever used. Let me start by saying I've only used this mouse for about a month. I can't speak to its longevity. I have however dropped it a couple times already so the durability seems to be there. Will you get batteries with this mouse? Nope. Let me also say I am an occasional gamer but I am not familiar with online gaming so I am not saying this is better than a professional gaming mouse. What I am saying is the is the best mouse I have ever used. It's a bit slimmer than an average mouse. The clicking surfaces. sans the scrolling wheel are all too smooth for my taste. I am used to a bit more rougher surfaces but I've played for long periods without any difficulties. The mouse works great for gaming. I've used the DPI or CPI button up top in games and it does help. It increases or decreases the counts per inch or dots per inch. I am not sure which. The side buttons are multi-functional. Basically they are forward and backward buttons. The front one is forward and the back one, closest to your thumb is your back button. They don't get in the way of routine use. They work in browsers as a back or forward button. They work in your pictures gallery as, wait for it, the forward and backward buttons. They work in SOME media players as a track forward or track backwards button. Like I said I only occasionally game so I haven't tried to change any of the button functions with macros or if it is possible, IDK how. I haven't had this mouse that long so I can't comment about battery life but this mouse also has an AUTO-SHUTOFF feature. I think it shuts off automatically after 3 minutes of being idle. A left click wakes it back up. I am pretty sure the left click is the only button that will wake it up.  I just know this mouse is a LOT better than the average mouse. You can usually expect to get what you pay for. This mouse's return well exceeds the investment.
892011
I love this mouse. It's very comfortable to hold and very precise. Takes no time for me to get used to it. The scrolling wheel is very smoooth. I understand the complaint of hte wheel click as a middle button, but I never used it, so it doesn't bother me. the Most often used buttons other than the main 2, are the forward and backward buttons. They are not as big as the original MS optical mouse side buttons, but they are less likely to be clicked accidentally. So far I love this mouse and have no complaints.
4751731
Orgasm in your hand, by far the most comfortable mouse I've used. Weight system is fantastic and the sensor is just superb (no tracking issues). I've owned this mouse for about 8 months and have had no issues with it.
1220312
Initially I balked at the thought of paying more than $15 for a mouse (this was back when you would have to pay $50 for this model.) and considered it for a long time. My biggest thing is that it has to be able to multitask and whether I'm in a video game or surfing the web, ALL buttons must function. Period. Having decided to upgrade to "gamer" equipment, that too caught my eye.

Upon arrival I thought that perhaps the shape might pose a problem, as I was used to the rounded-dome mice. It fit comfortably and snuggly in to my hands and all buttons were within easy reach. I have never had an issue with it being unresponsive or jumping around that wasn't solved by removing a stray cathair from underneath the optical sensor. It has gone strong through 3 moves and 2 years worth of gaming and the only thing that bugged me was the pads on the bottom wearing down and wearing off.

I adore this thing. It has become virtually indispensible when I am online with MMORPGs, allowing me to save moving my hands to different parts of the keyboard to strike hotkeys that were taken over by buttons on the mouse (and I didn't have to program them, to boot, it naturally picked up some of the more useful commands!)

I like this thing so much that when my last one met with an unfortunate orange-juice incident that warped the left click and stuck the back and forward buttons above the thumb, I immediately went out and tried to find another one. I'm glad I did, as I find this to be an incredibly reliable and useful mouse, and I have not once regretted the money I spent on it.
4037735
This mouse is absolutely great.

As a person with slightly above average hand size, it is surprisingly difficult for me to find a good feeling mouse, as I use a claw grip when gaming most of the time. It fits my hand like a glove. I hardly ever have to adjust my hand when I reach for it. The ergonomics are spectacular.

The RGB LEDs are pretty color correct, although some lighter colors aren't quite as accurate. For most of my setups with my other RGBs, it does absolutely fine.

The Logitech Gaming software is phenomenal. It works exactly as you would expect, and is very responsive. It's what the Cue software with Corsair should have been.

The weight tuning is great. The mouse is fairly light without the weights, but once they are added it is a good weight. I would like if the weight was heavier fully loaded, but it's absolutely fine for me.

All of the buttons on the mouse are easily acceptable and are all programmable. The configuration is fine with me from stock, but it is easily changed for your individual needs. You can even add macros to each button as well!

The DPI sensitivity is insane. 200 dpi to 12000 dpi. You can set 5 individual levels of DPI according to your needs, all easily adjustable on the buttons of your choosing (from stock they are the buttons directly to the left of the primary mouse button). You can also include a DPI shift, which is accessed by holding the button where your thumb rests. It can be used to lower (although some use it to heighten) the DPI for more accurate (or faster, respectively) mouse movement depending on your needs.

The scroll wheel is also great. I was unaware of the usefulness of the feature until I received the product. It makes scrolling through long web pages or applications a breeze. Instead of restricting the mouse by making it "click" every so often, you can release the mouse wheel and allow it to spin freely. You can also use it normally, if you wish.

The mouse itself is very grippy, but not too rubberized as to promote sweaty hands or be uncomfortable.

All in all, if you have the money, buy this mouse. It is great for both gaming and productivity.