I just installed this today. Fitment is good, but Yoshimura's torque spec for the clamp is only 6 ft-lbs, which seems way too low. I had to tighten the clamp way more to stop it from leaking.
Looks great on the bike. I rode for about 45 mins, and the inlet pipe has already taken on a nice golden tint.
The muffler seems noticeably lighter than stock. It is also angled higher than stock, which should make it easier to use a rear stand.
The sound is very nice, but is much much louder than I was expecting (even at idle). I used to only wear earplugs on the highway, but I will definitely need to wear them all the time now. I might try adding a baffle if I can't get used to the extra volume.
Overall I am happy with the purchase so far. Just be aware that the muffler is seriously loud. The comparison video doesn't do it justice at all IMO.