As a replacement for an M570 ball, it performs just as well and feels smooth.Unfortunately, if you're in a quiet room you can hear friction noise, even if you don't feel it.This is not the case with the OEM ball.(Note for M575 owners: I've seen comments where some people report that the M570 ball is a noticeable improvement replacement. I don't know if this Perixx model would be an improvement or not. Personally, if I had a nice ERGO I'd spend the extra 10 bucks on a 570 OEM replacement ball.
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