I've had mine for 3 years. I have a GT, the 6.0 has many similarities to the LS3 and responds to modifications very well.
I've had more fun surprising people with my 4 door.
They have little nuances as with any car. The Lower COntrol arms are known to squeak and the bushing prematurely wear out. The airbag system has been the subject of a recall for reprogramming.