I have the full system and I love it. There is drone between 1500-1800rpm. I personally don't mind it but have heard from others that it bothers them. The most important thing to remember IMHO is that personal taste in exhaust note is subjective, especially WRT aftermarket exhausts.
With the valves closed I feel that the sound is close to stock but with a more exotic note. Open valves are loud and sound great. Again I have no regrets with the full system; my M5 sounds more aggressive and I definitely feel it pulls harder.
Just my $.02
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