Had one fitted to my FZS600, now got one fitted to my FZ1 and to my VFR750.
Fuel Exhausts product is very good, it's good value, it's British, their customer service is first rate.
Baffles fit fine; but only at MOT time. Apart from the ride to and from the test centre, they stay removed.
Noisy? Yes.
Have I ever been pulled for a noisy can? In 13 years and 140,000 miles, no.