Got it installed last night. There is a touch of drone, but in my opinion not a deal breaker. Don't get me wrong, it's loud, but not nearly as loud as some of the reviews were making it out to be. Compared to the tomb like silence of the stock Fiesta, it is absolutely louder. It actually seems louder the lower in the revs you are. Cruising in 60th around 2500 rpm and I couldn't hear it over the radio.
Would I but it again? Yep. It sounds awesome. The fact that it ended up being almost $400 less than others on the market made it an easy choice.
Edit:// I'm wondering if the 2500 rpm drone, when accelerating not cruising, is actually the symposer and the exhaust resonance fighting with each other and creating a not so desirable sound. I'll disconnect the symposer tube tonight for the drive home and report back.