DO they hold up?
Yes, I have had mine for 3 tourneys and 9 practices and they are still in awesome condition.
Do they breath?
Yes, Very well actually.
They have knee pads that go all the way into shin pads and thigh pads = lots o bounces .
edit: Go get them, i am friends with mike smith, one of the ceo's of badlands paintball, and he told me the invert and empire pants are nearly identical, one of the only differences is the padding is about 3mm thicker on the empire pants and instead of double stitching like what the invert ones have, they have tri stiching, which will hold up a bit longer.