Have not tried it Joe, but I've used plenty of swivel wheel push mowers and they make the mower less compact, harder to access tight areas and difficult on slopes, which, for us, is the entire point of using a push mower.
Toro keeps trying to put make-up on this pig but strip it away and what's left is a heavy, cumbersome push mower that's not nearly as agile, good on slopes or accessible as a light 21".