Joined on 03/09/10
Not for everyone
Pros: Light weight, comfortable, zero configuration issues. Best used with a large screen monitor sitting back a few feet. Great for casual web browsing, and for sitting back, kicking up your feet while still effectively utilizing your comp. One aspect that I really like is the ability to traverse to different areas of the monitor with a minimum of motion from the mouse. For gaming this can be a usable tool, but only if you are comfortable setting up mouse over macros set to key binds, and of course that the game your playing supports such features.
Cons: Stability for many people can be a big issue, if over zealous with mouse clicks it's easy to miss your target. This is not your standard trackball or mouse, this is a completely different class of pointing device. You will need to be prepared to experiment with this device to see if it can be a viable product to fit your needs. I'd recommend not utilizing this device as your only pointing hardware.
Overall Review: If you decide to invest in this hardware, leave your preconceptions at home. Be willing to learn how to make this work. Otherwise, I'd say save your money this isn't for you.
The highest quality mouse on the market
Pros: The ease of movement on the ball of this device is incredibly smooth, accurate, and comfortable for long hours of use. I'll spend easily 12 to 14 hours a day working on my system with zero mouse related fatigue. Expect at least 5 to 7 years of heavy use out of this device prior to failure. Given the fact that with other pointing devices I'd spend easily 5 to 10 times the purchase price of this one mouse, that's a lot of money saved. And that point alone makes this the most economical choice out there.
Cons: As with any trackball as compared to a traditional mouse regular cleaning under the ball to remove lint and various particulate matter is needed. Wrist angle, not a real con for me as I've solved that issue by using a mouse pad with a built in wrist rest that leaves me in a comfortable position. The ideal set up with this mouse is to have the mouse resting at a point slightly above where your elbow sits. Around a 30 degree angle works best for me.
Overall Review: After nearly seven years of use I'm finally having to replace this due not to it failing to operate, but rather I wore clear through the left mouse button to the point of a small hole now appearing. This is, for me, the absolute first and only computer component that has lasted longer then the outer casing, and that's speaking for three decades of experience.