Black ice spare is poop. I owned it twice and didn't last long, thumb chipped away easy. Granted I use a slug, which is part of the reason why the area cracks, but I've owned other spare balls that didn't have that issue so quickly. I go through spare balls due to the cracking thumb hole/area.
I have a C300 that I've used a lot this season and "thump" the ball more often than before. So far no scars are seen and the ball is holding up pretty good.