I owned a pair of the previous version (Triumph 8) and really enjoyed them. I've only had the Triumph 9 for a few weeks now, but haven't had any type problem whatsoever yet. I didn't find any problem with the change in mm's that several other reviewers experienced. I especially like the fact that the Triumph 9 is offered at a discount $$, since the new Triumph 10's are now available. I plan on ordering a pair of the 10's after my 9's are worn out at a discounted rate next year...and so on.....etc....