A buddy of mine at work had his brothers Roush 427R Mustang, I think it was a 2007 or 08 Model...anyways he lives just down the street from me, so I went over to his place after work for a spin in...anyways here are my impressions:
HOLY FUCK its fast! I have a 06 Mustang GT and the pickup feels "slow" now on it LOL It was downright amazing how fast the car felt from the passenger seat. It went to 80 breaking no sweat and felt like it had plenty more to go around. If the 5L V8 gets 400HP/400ftlb next year in the Mustang, the 2011 Models are going to be some serious shit on the road.
The Roush updates to the susepesion where pretty impressive also, we where whipping around the jughandle on to the highway doing like 80 and the car didn't feel like it wanted to slide around or lose control.
There where a couple points I was almost scared by the car, partly since I haven't driven much with my co-worker and some of the roads that we where on I wasn't too familar with, so him getting on it and not knowing what to expect made my heart jump a couple times, but hey thats half the fun :D
Downside...Holy crap the Mustang Dash is so cheap/cheezy looking without the IUP on it...I was also really suprised to see that the LCD Info screeen thats under the MPH gauge was MIA,I thought that was standard on GT models, I have it on mine. The seats looked nice, but wheren't any better then the seats I have in my GT.
Anyways, a really impressive car....I'll have to seriously consider adding a Supercharger to my Mustang down the road...but that won't be for awhile, I need to pay it off, replace it with a Fusion Sport or Taurus SHO and get a house to keep it in as a weekend driver :P