I have a new B7800 (5 Hrs) and a 72"RMM rear discharge. I like the rear discharge because it spreads the discharged grass clippings over a wider area than a side discharge, so rows or bunches of grass clippings are less noticable and they disappear faster. However, the B7800 with RMM takes up alot of room in my garage. If Kubota had a rear discharge MMM I'd have one, so that I could gain more garage space.