i've used my toro 52" grandstand for 3 years now and absolutely love it.
it handles hills just fine. there is no weight problem.
i do strictly residential properties.
i've used walkbehinds, stand ons and sit downs. i'd choose a stander over a sit down any day of the week. you do need a small walkbehind on the trailer though. i carry a 36" walkbehind to get into a few gated backyards. but it only leaves the trailer 2 or 3 times a week for me.