Had the F-sport exhaust installed Saturday, sounds excellent through most of rev range (especially mid to high revs), not excessively loud. Since I use this car for weekends mostly, it's a perfect exhaust system for my taste. Loud enough to be satisfying, but quiet when driven conservatively.
Pros: Semi-exotic sound, nice finish, good fit, pretty quiet in cruising mode (at steady speeds).
Cons: A little bit of droning at 80mph+ speeds.