Cvt has its advantages and downfalls but overall fun imo. I have 109k miles and it's been tuned since 83k, I'm not saying they won't break but if you deliberately thrash it, then it will break. I haven't had any problems with mine. I've maybe brake boosted like 2-3 times it's fun but has bad...
Don't do it repeatedly though it and don't do it until your trans temps are at normal operating temperature, like 160-175. It's not the overall torque that breaks cvt's it's the delivery of tq and sudden ramp in temperatures. And with brake boosting in cvt don't immediately slam it to the floor...