I've shot it and the P90 both, the Five Seven is a big honkin gun! Not concealable worth a damn, unless you're 6'8" and 300 lbs... Shoots okay, but ammo restrictions and price are gonna be a mess. P90, while it is butt ugly, is a fun little shooter! 50 round mags, compensator cut at 45 degrees, and pretty damn stable on full auto. Rounds tend to peter out at about 100 yards and fall into the dirt, but good close up accuracy (<50 yards). Easy to shoot semi auto, 3 round burst and full auto; just keep pulling the trigger back further THe one I shot was loaded up with an aimpoint and it pretty much shot POA/POI.