So i just sent a text to a buddy who works for camoplast tracks and as of a week or so ago he already had over 600 miles on his 13 pro!! I am pretty sure that means he has at least done two to three track swaps on it so he should be getting a pretty good look at the drive shaft. I will post any info he passes along to me. ** Side note he had two pros last year with over 6000 miles on them with zero problems.**