Actually, according to MotorTrend in 2005, the G55AMG went from 0-60 in 4.7 seconds! (Link: 2005 Luxury SUV Trim, Steering & Interior - Motor Trend)
According to Car & Driver, the 2009 G550 goes from 0-60 in 5.9 seconds. (Link: 2009 Mercedes-Benz G550 - Short Take Road Test - Auto Reviews - Car and Driver) Not exactly slow either. It may feel slow i guess because you sit really high and the gas pedal is heavy.
Yeah, i think that the updates are pretty cool too. Yeah, given the choice of G550 vs. G55AMG, i would go with G55 simply due to the issues with the 7-speed auto (that i have read about). The 5-speed auto is pretty damn strong (torque capacity on it is around 800 ft-lbs of torque!)...and smooth. And this is why the G55AMG still has the 5-speed...the 7-speed auto cannot handle the torque of the AMG supercharged engine.
I remember MT back when I had the S2000 said it could do 0-60 in the low low 5s... a wee bit optimistic that mag.
good info on the 7 v. 5 speed. makes sense.
all i need to get are the 22" Hamann Edition Race wheels and i'm good!