There's been a prominent issue with all male figures after M2 that's been pretty much ignored. If you raise any Unimesh figure's arms straight up (perpendicular to the floor) as would a football ref confirming a goal, the figure's lats, shoulders and chest become a taffy-like mess. Not even DAZ has been able or willing to correct this problem. M2 however, has shoulder, chest and lat morph-fixes that adjust those issues well. If you could address that problem, it would be a milestone;)