You might read that some people don't like the pop/burble coming out of revs. Gun to my head, if I had to pick one "negative" that I thought other people might have an issue with, that would be it, but I actually like that sound. Just my opinion.
I have the S-Type on my 2011, and after I had a Roush TVS installed, this characteristic was exaggerated quite a bit. It got noticeably louder at WOT and in the upper RPM range. It also gurgled and "popped" more frequently when letting off the throttle. After putting on a smaller pulley and VMP tune, OMG! It sounds crazy now, especially when you get on the throttle hard and then let off abruptly. It rumbles and pops everytime, almost as if it is begging you to step on the pedal again.