They were so much fun to drive. We bought an 06 back then as an R&D car and I got to drive it pretty regularly. The 6.1 was a beast, especially for the time. Would light the tires up from any roll under 40 MPH, tons of fun.
FWIW these are MUST tune cars. The factory torque management is constantly keeping things from doing what you want. Tuning wakes them up big time.