Review on Perixx PERIPRO-303 1.34 Inches Trackball - Pink Replacement Ball for M570, PERIMICE-517/520/717/720, and Other Compatible Trackball Mouse by Wendy Kennedy

I bought this replacement ball for my Logitech MX ERGO which worked fine until I accidentally dropped it and subsequently left a scratch on the original ball. The ERGO still worked, but occasionally got stuck when the support pins got stuck in the hole and caused the ball to resist - not enough to actually damage anything, but enough to make digital painting difficult, and enough to bother me to annoy. This spare ball did that for me and has proven to be a worthwhile expense for me. ERGO and M570 have the same bullet size so this bullet can be used in both (I used the bullet from my old M570). at ERGO while I was waiting for that ball). Replacement takes 30 seconds and requires no special tools, although the pencil makes removing the old ball much easier. Two different types of finishes are available: glossy and matte. I chose shiny red. The work went absolutely smoothly, without resistance and jamming. I didn't notice any operational differences between it and the original gray bullet that was in my ERGO. And in my opinion, the dark red color of this bullet actually looks a little better than the original silver bullet, as well as the blue M570 bullet. It was an inexpensive replacement and has worked very well for me so far. He restored my trackball to how it was before I damaged the original ball, which is really all I needed. Based on my experience with it, this ball can easily be recommended if you need to replace the ball in your Logitech M570 or MX ERGO.