I run a 36 Scag belt drive on my smaller lawns. I love it. the cut is amazing. no idea on the age, but i bought it used off a homeowner. has a Kawi 15hp i think. I'd guess it's a mid to late 90s unit. I've never used a hydro WB but lots on here say those are the way to go. The belt drive can be a fighting match sometimes, but I've learned to just go slower, and not try to wrestle it so much. For the price and how easy they are to service, I don't think a belt drive can be beat.