I just traded in a 2006 300C SRT-8 and 2005 Crossfire SRT-6 for my 135 so I have alot of experience with SRT vehicles. The Cherokee SRT-8 is a beast! I did the SRT Driving Experience and the Jeep had the best 0-60 times because of the AWD during launch. It handles surprising well for a Jeep. Probably not as well as a German SUV, but it's going to be a lot less. It's an amazing engine and I think it looks awesome on the road. The interior and fit and finish is not going to be up to par with other SUV's, but again, you're paying for the 6.1L Hemi and the ability to take many sports sedans when the light turns green!
Have you driven one yet? You should be able get some good deals on an '08 as well. Check the Jeep forums, too.
2013 M3 - MW, Carbon Fiber Roof, Competition, Cold Weather, Premium, 6MT, BPM Stage 2 Tune, Dinan Intake, Challenge Race X-pipe, Corsa Exhaust, Ultimate Clutch Pedal, M Performance Wheel