Summary: A great mouse for a non-gamer, look elsewhere if you want a mouse that is going to last through numerous clicks.
Pros: Great control and accuracy, once one gets used to the feel of it very hard to go back to a normal mouse.
Cons: The buttons wear out unusually fast. I have used this style of mouse for over 5 years or so and recently I have had to replace them much more rapidly than before. I use them for gaming and probably press the buttons more than an average computer user, but the mouse isn't even lasting 6 months anymore.
Excerpt: Since I have owned a PC I have used a Logitech TrackMan® Marble Mouse the first one I bought had tiny metal balls instead of the plastic one's they now use. I dont like the plastic at ALL they are not as smooth they dont last as long.
Excerpt: We currently have the Logitech trackball with the ball under the right thumb. Bought this because one of us is a lefty. Neither of us could guide the mouse with any precision and then the click would move the mouse causing wrong selections.
Summary: This is my first trackball mouse and I'm never going back. It takes up less space and is more responsive than any other mouse I've ever used. It took a few days to get used to the quick action and the location of the scrolling buttons other than that I have had no issues with the mouse and I would definitely recommend it to a friend.
Summary: im in the market for a new trackball. ive used a Logitech Marble Mouse Trackball for about 3 years. one of the buttons has become weak and falters. i hold it down, dragging the things onscreen, and the button flickers off, dropping what im dragging. is the life of a mouse 3 years? can't we shoot for 10?
Summary: Bought it from a local store. The optical mouse somehow changes my CTX 19" (brand new!) monitor different colors. I don't know much about hardware (and don't care to learn since ecommerce security is my field), but don't waste your money. Buy another brand.
Summary: This Logitech trackball is pretty good--durable, sensitive, with sensible button placement. That said, its ergonomic design isn't for everyone; my large, stubby hand and fingers aren't ever quite at rest with it. (Could it be that that's the secret of ergonomy?) I hated it at first, but have grown used to keeping my wrist muscles slightly tensed.