I've got some on my soon to sold '08 and with the baffles in it sounds solid, obviously better than standard, but unremarkable to be honest.
With the baffles out it sounds much better of course, but while it's quite loud and beefy it's no where near as loud as I thought it might it be and it's also alot less thumpy than a Duke with some de/un-baffled Termignoni's on.
Either way though they're great high quality cans and while they sound very good I like the fact that they're not too loud as that can attract far too much of the wrong sort of attention if you know what I mean. I never had a copper look twice at them to be honest but then I don't open it up in built up areas so if you're sensible baffles out shouldn't be a problem.