I've driven a Schiada 21RT with a 540 Bulldog I/O and comparing it to my Dimarco 21 V-drive cruiser (its the same bottom as a Spectra and Howard) with an LS6 my V-drive road smoother than the RT, power was similar I think the V-drive was a little slower, the RT with the I/O backs easier but I'd take the V-drive any day of the week over the I/O. I've never ridden in a 21RC so I can't compare but I've ridden in a few Rayson Crafts and thats the boat I dream of having.