IMO, that GXP is friggin' cool! If there were no Camaro, that'd the the first car in line for me to get (well, a CTS-V; but that's too much $$$). I'm sure Camaro times will be dropping a tenth or two when the rags' start reviewing in weather with a little better traction because although the cold is good for power, it ain't good for hookin'. I think the power and weight differences aren't going to mean too much in terms of raw speed, but the handling is where the spread is going to be a little greater.
Either way, Camaro is based on the same chassis, has similar engine/drivetrains, and weight and harbor no disappointment at all. They're great improvements on top of the older generation cars, IMVHO.
05 Hummer H2 SUV on OEM Air Ride
Forged 11.4:1 408 LQ4 (K1 crank & rods; Mahle pistons)/CPP LS3 CNC heads/BTR Stage IV LS3 cam/home ported L92 intake manifold/ported 90mm TB/custom Volant CAI/mid-length headers/AFE dual 3" CB/Corvette Servo/el cheapo lift/Cognito UCAs/Sphon poly adjustable TA/Sphon adjustable rear LCAs/e'fan conversion/DirtyMax radiator/Moroso catchcan/HPTuners/HID conversion/LED exterior lighting/LED interior accents/Autometer Cobalts/AEM WBPioneer AVH-5600BHS/Pioneer GM-9601/2-Pioneer TS-W310D4s/Obcon Labyrinth dual-12 box/lots of other little stuff