ProtoArc EM01 user how is the finish of your ball?

I'm wondering how gritty other people's EM01 balls are. Using a ball from my Logi M570 was already an improvement, but today I tried a Sanwa ball and the difference is huge. It's even smoother than the M570. Definitely worth the $12.

For the EM01’s price, I do wonder if ball quality varies between units. I've been eyeing the Gameball Thumb, but I don't want to risk getting another gritty ball.

Anyway, big thumbs up for the Sanwa replacement balls!