Logitech Cordless TrackMan Wheel
592096
One of the best products there is apart from lack of product development. I would like some more buttons like those on more modern Logitech mice such as sideways scroll and navigation on websites. Otherwise it's ergonomy is flawless and helps me continue to work with computers, ordinary mice gives me excruciating pain after a time.
1862107
I'm used to using a trackball with my pointer and middle finger to control the trackball such as the Logitech Trackman Marble Mouse. I was not sure if I would like this trackball since this is setup to use your thumb to control the trackball. I love using this trackball mouse. The design is perfect and contoured for you hand so it fits naturally. I got use to using my thumb in no time at all. I love the use of the scroll wheel, and the standard right and left click mouse buttons. You can also download the setpoint software from Logitech and customize the button layout. The other main point is the fact that this is wireless. It has a small use dongle that you barely noticed. Once plugged in my Win 7 laptop it installed the drivers (No software CD needed) and I was on my way. I give this Logitech M570 Wireless Trackball an A+ and would definitely buy again and recommend for anyone looking for a trackball mouse.
660584
I decided to try this style of mouse, because I have a small area to move a regular mouse that I often had to lift it up and reposition it to move the cursor around. With the trackball, I don't have to do this. Also, I have purchased other Logitech mice and keyboards and have been very satisfied with their quality. So for a lower price than the usual products of this type, I would definitely recommend Logitech as a good company to look for. Also, this mouse comes with software that enables one add other wireless Logitech products for use with the same usb dongle.
4894646
I used a Logitech wired trackball for 61/2 years and loved it....the wireless version is even better!  Very smooth, fits my hand great and 2 programmable buttons!  Definitely recommend!
3644928
I'd gotten this keyboard out of necessity, as the plug for my old keyboard was broken when I tripped over the cord, and I needed a usb keyboard. I tried another corded one, but it was too short of a cord and still annoying, as I am clumsy to no end.
I'd already bought a logitech trackball, as I hate mice, so I got this keyboard--it's awesome!! I've used it for months now, and with the unifying software from logitech, I only need one usb port for both the keyboard and trackball. Great!
2416290
Long ago I used Logitech wired trackballs for AutoCAD and was very pleased. Recently I got a M570 wireless trackback. Great ergonomics but ball has excess friction - it is hard to roll (side to side cursor movement) but ok cursor Up and Down. Have spun it for several hours and it is not loosening up. So I am not happy. I guess I just wasted some hard earned cash. CAD guys depend on a free spinning wheel - spin it hard and stop it for large cursor movements. This cannot do that like the old ones did.
1015653
Order was delivered on time and the mouse is as described. I am a little concerned about how long the wheel will last. Seems a bit lose after a week of use.
3719560
As a long-time Logitech corded trackball user (my first being a mid-90s era Trackman Marble+), I decided to take a gamble on this Sanwa.  This thing is perfect!  Even better than the Logitechs!  The ball is a bit bigger, and the resolution is a LOT higher.  I had to turn down the sensitivity a bit, but it is very smooth, very precise.  The scroll wheel is also a big improvement.  Excellent price too!
761010
About 10 years back, I was experiencing sharp wrist pain that would shoot up my forearm.  I switched to the Trackman Wheel (with cord).  Within a week, my pain was gone.  I bought one for work too.  I was extremely disappointed to find that Logitech had stopped manufacturing the Trackman Wheel (as I still use it and was hoping to get a new one, as I think I've worn this one out).

I caved and bought the M570 (no cord).  While I was not thrilled at the prospect of having to replace batteries in one more device, I decided to give it a try anyhow.  Right out of the box I was impressed with the ease of setup.  A very small USB Wirless Bluetooth chip fell out.  I inserted into the USB hub on the front of my PC, turn on the power to the trackball, and immediately the device was found, loaded drivers automatically, and within about 45 seconds I was using my new trackball.  It's been a few weeks now and I have absolutely no complaints.  The transition has been very smooth.

Now, just make one with a corded USB.
3868659
I bought this mouse because it combined a track ball with a bluetooth interface, and it was not too expensive.  In fact, I find I use it mostly as a mouse (it is easily switched between track ball mode and mouse with scroll-wheel mode).  The ball is about 1 cm in diameter, and may be a bit small for regular trackball use, but it is fine as a scroll wheel.  My only real complaint is that it is hard to get the battery compartment cover on with rechargeable batteries, which seem a hair larger than regular AA's.
3004037
This is the 3rd time I have purchased a Logitech trackball type mouse.
The others are still in working order and are still getting a lot of use.

The first Logitech mouse I bought was the Trackman Marble, which I have now used for about 10 years (??), or so, probably more. That mouse requires you to move the cursor with a trackball located on the left side of the mouse, meaning you move the ball with your thumb.

This style, I think is designed better, as the ball is in  the middle and you can use various fingers to move the ball, meaning that your thumb is not doing all of the 'work'.

Note, however, that it does take a bit of getting used to: you move the mouse cursor by rolling the ball around with your fingers.

The software is simple to install and lets you adjust the sensitivity of the trackball. Using the software, you can also program (various preset options available)the two little light gray buttons at the top of each of the right and the left (dark gray) mouse buttons.

As the mouse itself stays put, I find that it cuts down on the stress on my hands. As I am not constantly shoving a mouse here and there, my hands cramp less and using this type of mouse is less stress on my arms/shoulders.

All in all, a great mouse for a reasonable price!
4146599
My error.  I did not notice it did not have a wheel to scroll up and down like my previous one.  But otherwise worked fine (I bought a different Logitech on with a wheel.)
3040781
I have owned and used the TrackMan for more years than I can remember. It is almost perfect!

I won't get into the virtues of trackball vs. mouse. It is simply dependable and accurate. It has no wheels to accumulate gunk and interfere with its operation. My only (minor) gripe with it is the lack of a clickwheel and/or 3rd mouse button. This is only an annoyance for some gaming applications. Apart from that, pointing devices get no better.
3736642
They'll never make a trackball as good as the Logitech T-BB13 (the old white one), which this is replacing. I've repaired it many times over the years, but the scroll wheel has finally died :( The M570 was never reliable enough to take over, as many of you know.

Anyway, I think this is the best available trackball that is made today. The "claw" position that this forces your hand into is not as comfortable or natural as I like, but after a few days of use I am convinced that I will eventually grow accustomed to it. The action of the ball, wheel and buttons are all good while their positions could be better. Their orientation needs to be flattened and spread out a little.

I run XFCE on Arch Linux. The device was detected immediately and everything worked automatically except for the phantom 6th button, which I don't care about. No need for any proprietary software as the built-in mouse settings app worked fine for adjusting speed and sensitivity. A simple xset or xinput line in your ~/.xinitrc would work as well.

In short, it's not perfect, but it's the best you can buy today. Let's hope they keep making them.

Added a couple pictures: Why can't someone just clone perfection? (T-BB13) The Elecom is a little twitchy, had to smooth out the motion a bit. (XFCE Mouse Settings)
969163
This is my second M570.  I bought my first one for about 6 years. I finally had to replace it when it just wore out and started giving double clicks when making selections.  I was totally satisfied with the service I got from it, but when I started looking for a replacement I thought I would upgrade to may be a newer different device.  In my search I couldn't find anything better at this price point so I purchased another one.  It came in the mail two days later, I plugged it in and was up and running.  I don't think you'll find a better trackball mouse for the price.
2517143
When my Trackman mouse started acting by not acting at all and could not find a replacement I was thrilled to find this unit in near perfect condition. Then I disassembled and cleaned my old one and now I have two. I may be set for life!!!
581635
With limited room for a mouse next to the laptop on our small kitchen utility table, this Trackman product was the perfect solution.

The only thing I wish it had was a scroll wheel, but I knew it didn't have one when I purchased.

Very smooth and precise. Don't hesitate to get this!