Rating: 
Summary: Sweet little number
Review: This is an excellent trackball. I have used it for some time now, and until I picked up a MS Trackball Explorer, this was my favorite input device. While I enjoy some of the "advanced" features of the Trackball Explorer, such as optical sensors (no cleaning!), scroll wheel, and ergonomic shape (this is a great piece for web surfing), the Expert Mouse still has a special place in my heart. :) For longer periods of use I generally prefer it, and the large ball makes my hands happy. Also, tech support is PHENOMENAL, far better than MS. In fact, I had to replace my expert mouse not long ago (5 yr warranty!) and they happily sent me out a new one. No RMA, no return, no _anything_ except "we'll send one right out". And they answered immediately. Most of the time with computer tech support, I don't even bother, and either try to fix it myself (easier said than done w/ hardware) or just bite the bullet and replace it. In this case, it was a pleasure to call. If I could give an add'l star for "extra credit", this trackball would rate a "6".
Rating:
Summary: Great Product
Review: This is one of the best trackball mice I have ever used. The bigger size of ball helps you controll the mouse pointer much better. You can also configure 4 buttons to do most of the things you want to do with during a typical mice use. (I use top two buttons to move forward and backword while browsing Internet pages.) Its also very easy to change the behaviour of the buttons. Although I have used this mouse only for a month now, I have already become a big fan. I also feel that maintainace should easier that other trackball mouse.
The only thing bad about this mouse is its price. At $100 this is about twice other comparable mices. But the ease of use and useful featues easily make up for the price.
Rating: 
Summary: Great Design, Poor Software
Review: This is the best designed mouse on the market, from an ergonomic point of view. It is extremely comfortable to use and can take heavy use. I love the design and the flexibility of the button assignments. However, the software for NT and Windows 2000 is very poor. Like another reviewer, I had a crash while installing it on NT. It also crashed while being installed in Windows 2000. Since then the mouse periodically loses all its programmable functions, requiring a reboot to get it back. Tech support says they know this is a problem...No fixes. I was very sad to have to switch to another brand. If you are running a version of Windows which is well supported by Kensington's software, this is a great product. I can't imagine a better mouse. I just wish Kensington would write software as good as their mouse!
Rating:
Summary: One of the best!
Review: Work's fantastic with persion.Easy to install,but you might need tech help on different pc's,notebook's ussually.I own 2!The best one that I like is the expert mouse pro trackball,you need a usb port & work's good with window's Me.....I highly recommend both of them.........!
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