I just had to write this review as soon as I got the M575. It's just so impressive, at least straight out of the box. Personally, I think once you adjust to a trackball, you'll never want to go back to a mouse.
I have two very old M570s. They've been dreams to own. They are no longer manufactured by Logitech and according to recent reviews, the most recently produced ones don't compare to the older ones in terms of lifespan or quality.
One of my M570s has seen only light use, while the other has seen very heavy use. The left click button eventually went wonky on the one which was heavily used. Reviews indicate that the newer M570s have been subject to "cost-effective" redesigns to hold it's price down and they now often fail pretty quickly.
In any event, save the money you would spend on one of the remaining M570s and step up to the M575. It's a bit larger so it feels better, the button clicks are much better, the scroll wheel rolls very pleasantly in a notch-type fashion, it feels like it's made out of slightly better materials, and it's got the option of blue-tooth (which doesn't matter to me at all). Really, everything about the M575 is better than the M570. I also really like that it takes an ordinary battery and not a rechargeable one, but this is a matter of personal choice. An AA battery goes forever in these things.
Seriously, shell out for the M575 over any remaining M570s out there. The M575 is just so much nicer. Now, let's just see if the M575 can match the lifespan and durability of the original M570s (mine are so old that I can no longer remember not having them).
| Average Battery Life (in hours) | 24 months |
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