I‘ve owned and wore out a few of the M570’s. The Elecom has the same issue with the right button wearing out/sticking after a while. Recently picked up the Sanwa (http://www.ebay.com/itm/Sanwa-Wire…) which so far feels like it is built better.

I‘ve owned and wore out a few of the M570’s. The Elecom has the same issue with the right button wearing…