Excerpt: I am so happy with this mouse. I was looking for a very simple trackball mouse, one with the red ball in the center, but Staples was all out of them, so I bought this one instead. It cost more than I thought it would, but my fingers were so sore from using my old mouse, that I thought, what the heck & bought it. I have to say, I didn't think it would be so easy to get used to, but it was.
Excerpt: I have always preferred the trackball. This Logitech is a well made and reliable unit. The wireless works well. Battery life seems strong as I have not needed to replace the included battery and the life estimate in the software shows it will last many months yet. It was easy to install and set up. Ergonomically, it is smaller than older models that I have owned and this is moderately uncomfortable as I have very large hands being 6'4" tall.
Pros: Accurate Tracking, Fast Response, Glides Smoothly, Great Features
Summary: great replacement mouse for my Microsoft Optical Trackball mouse which Microsoft discontinued. This was the only other model mouse with the trackball on the side that I could find. And a great price too.
Excerpt: It works great. Have to get used to the trackball being on the side & not in the middle as our old one was. Like the scroll roll that allows you to do it automatically or by clicking on the menu. It will be just as useful as our old one, once we get used to it. I would recommend it to anyone who likes this type of mouse.
Summary: I would have given this five stars, but the notorious omron micro-switch oxidation issue is a pain as the trackball needs to be taken apart to be returned to working status. This problem is endemic among all Logitech mice that use these omron micro switches, which is every one I have every owned. Given that, I love this thing for how much easier it is on my arm and hand.
Pros: - Easy to clean, - Battery lasts a couple months (four year old rechargables), - fits right hand well, - Ball spins smoothly
Cons: - cleaning the bearing requires a tool and needs to be done every other week. Can't they design a bearing that self cleans?, - the Omron microswitches need contact cleaner applied after a year if the trackball is used daily.