Accessories

Best trackball out there, though need for laser arises.
This is a really great trackball. I have used the original PS/2 version, then got a USB and now went wireless for work. Works quite well.
However, I think it's time for Logitech to create a similar one to use laser for better precision. At times it feels like the movement is not 100% accurate (as if there is a slight lag in movement). Not really noticeable though unless you have used a laser mouse before (very smooth movement).
This is definitely a lot more comfortable than most trackballs I have used.

Best mouse in the world!!!
I have been using this @ home & work for years. Doesn't take long to get used to, once you do, you won't go back. Years of daily use with absolutely NO issues..... Stationary with no cord & long battery life (6 months on a AA?)

USB reciever too big
I have a corded version of this track ball that I use with my desktop computer and I thought I might use this with my laptop. The USB connector that sends out the signal is too big and in the way.

Great option for long term use.
I had the corded version of the mouse before, and it fit my hand just right. I could use it all day without fatigue. (The middle could be a little less arched, but it's not really worth complaining about). I use a 4000dpi corded laser mouse for more precise things like Photoshop, but sometimes I just want to lean back and put the keyboard on my lap, and the trackball on the arm of the chair and relax a bit. This is a great product provided it fits your hand comfortably, and I would suggest anyone try it. It's durable and well made, and comes with a 5 year warranty. Note that the reciever is rather large, and if you were using it on a laptop that might matter to you (I suppose). The large size might have something to do with the fact the mouse only takes a single AA battery that will last quite a while. Whatever the case, I like it a lot and recommend this cordless trackball.

It's ok....
It's an ok mouse. It would have been better had it been like the Logitech Revolution rechargable mouse and have a charger and not have to use batteries. The wireless node is a lil large but not too terribly large that it's unusable.