I'm guessing folks who like this exhaust are going for the looks primarily which is understandable, it's a departure from the traditional look.
For those that are going for the sound and trying to retain their warranty are going to be disappointed. The sound might be few decibels higher, but nothing significant (listen to video below). They may be tempted to add a midpipe, but then that'll void the warranty. Personally I wouldn't worry about warranty, I've had an exhaust on all my sports car and not once did the dealer give me grief. Never had any issues by replacing with an after market exhaust.
Price is ridiculous too for the sound, $8180 + $200 shipping + $1600-1900 (optional midpipe) = $10k
To each their own, if you're happy with the exhaust then go for it.