The 300SRT8 is really fragile at the lower front fascia (plastic). The entire bottom of the car seems to be plastic panels. At the same time it’s really low to the ground so if you mistakenly park too close to a semi high curb or over one of those curb blocks you can cause yourself an expensive fix. Also, the 300CSRT isn't as much of eye candy as the GC.
On the flip side its performance is incredible. It can be surprisingly mild mannered (great and comfortable for daily driving) and looks sharp, especially at night with it's HIDs.. Then, when the throttle is mashed it wakes up turning what seems to be an everyday luxury car into American muscle performance; accelerating with the grace and majesty of a Boeing 747. The only "at-a-glance" giveaway is the subtle SRT-8 badge on the rear (unlike the other 8's that all look fast and mean). But to the untrained eye it's a typical harmless sedan with a slick demeanor. It's lighter than the others and, though the GC will take it at the line with the 4WD, the 300 will catch the GC and leave it behind. The 300CSRT is the ultimate sleeper IMO.