Received my OCPC this last week and had the privelege of using at Spokane Airsoft's OP:Cascade Raven.
Easily the most comfortable LMG vest I've ever used. The vest distributes weight very well and the included shoulder pads are adequately padded. The cumberbund is adjustable(had to tighten mine just a touch) and provides more than enough real estate to carry my IFAK, 2 Thunder B grenades in HSGI pouches, a Tactial Tailor MBITR pouch and a GP pouch. I mounted 2 Pantac M60 pouches to the front flap, a Tyr admin pouch to the front and a Tyr 50oz Vertical hydration pouch to the back. I am also wearing an Eagle Warbelt with 2 .45 Flyye magazine pouches and a dump pouch. The vest rides high enough to use all the belt mounted pouches with no problems.
I am 6'3" 260 and a large fits me just fine. I do need to adjust it to ride about an inch higher.