The LS1 which is in mine is a bit slower than what my double decat supra was, i think its around 5.9 ish 0 - 60, 160 top end but its a bigger heavier car than the supra and doesnt give the same punch on acceleration. I think its the way its geared rather than lack of power that made the 0 - 60 slower.
Dont get me wrong its still a quick car and accelerates on a big wave of torque with the V8 vibrating the rear view mirror under load.
It corners pretty good too but it is setup soft for comfort but Monkfish performance can sort things like that. Also very tunable with remaps, headers , cams, superchargers. An exhaust and remap should take the LS1 to around 400hp.
The MPG isnt bad either 1500revs at 70 means 28 - 30 mpg, I have seen 34mpg but that was sitting for ages at 50mph on a busy road. In town it averages about 21 - 22 mpg.
I cant really say what the LS2 Monaros are like just that they have 400hp probably have stiffer suspension, bigger brakes but vauxhall will try and charge nearly 1000 quid a disc for them.