I've always been a trackball hound and am always looking for a better one (having had 5-6 trackball mice over the years.) The M570 is the best of them, in my opinion. It has a solid, stable feel and the wireless feature is a welcome one. The ball moves with ease and, with a little practice (2 hours), the accuracy of the trackball on the screen is excellent. There is no jumpiness at all in the cursor/pointer. The two "forward/back" buttons are nice and well-positioned. Because I do a lot of text work, I changed the programming of the buttons to "page up/page down" and they work very well. If there is one feature that I would like to see in future editions is the use of an MX Revolution-style scroll wheel, where the wheel can be put into hyper-mode by scrolling faster. This, however, is a want and not a real need. The battery low indicator is a good feature -- nothing worse than a dead mouse when you really need it. Some may consider the price a bit much, but IMO, I want the best, most comfortable mouse there is, being that I work 12 hours a day on my computer -- money is no object when it comes to comfort. Overall, I'm very delighted with the M570, Maybe this is my last trackball? Time will tell.
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