I have been noticing problems that 1st year owners have had with their SRT Chargers- namely leaking transmissions (O-ring adapters) and 1-2 shift lags.
Both of these problems are fixed under the warranty, but it makes you think about waiting for the 2009 Challenger model (less problems and, hopefully, cheaper price).
Regarding the shifting problem, here is what the service bulletin says:
Flash: SRT8 - Delayed Or Rough 1-2 shift at Wide Open Throttle After Kickdown
Overview: This bulletin involves selectively erasing and reprogramming the
Transmission Control Module (TCM) with new software.
Models: ALL 2005-2006 SRT8 models of the 300C, Charger, Magnum and
Grand Cherokee (North America and International Markets).
Symptom/Condition: The customer may experience a delayed 1-2 shift at wide open throttle after a kickdown. This is often referred to as a harsh or jerky shift which is the result of the
engine reaching the maximum engine speed
fuel cut off prior to the transmission shifting.