Was happy to see the way the seams up front were designed, but unfortunately the zero flex caused my junk a ton of trouble even after a couple of rides and lots of "manual adjustments". I have wide hips so this may have led to it being to tight up front, and either creating to much compression up front or sliding everything down into my chamois on standing climbs. Other than that, the rest of the construction was fantastic. Great compression in legs, well designed back and straps, and cuffs on legs were nice and tight without being constricting.
My feeling is that these will not stretch (solid construction) and my helpful RS chat guy agreed that going to a large would throw the rest of the exception fit off just for the crotch give.
Trying out the Castelli Velocissimo Due Bib Short based on my chat feedback.
RS customer service rocks and made the switch painless (even if my nethers unfortunately didn't get through it so easy).