As above really, I've looked at all the options and this is the best mask option out there. However I only use a mesh mask when running a helmet which is about once every 2-3 years on average heh; so no real feedback from use yet. That said, I swapped the harness on the OT with some short straps that clip in to an Ops-Core taken from an older, similar mask I picked up on EBairsoft years ago. Luckily both have split/removable buckles attaching the straps so I didn't have to cut anything, totally reversible mod.