Our 76B in VIP rigout is very smooth - the engineer works carefully to take it all out.
Sometimes, though, on a cold morning it is a bit like a gravel road between 120-140 kt until the dampers and the rest of the head warms up.
Soundproofing is pretty good, and the rear double-glazed windows with tinting stop the gawking spectators while taxying around or at the FBO.