I apologize for not being a commercial mower, but I do mow about 6-7 acres (live on a farm). About 1/2 acre is zoysia, rest is buffalo, bermuda, fescue, weeds, etc. The zoysia has to be bagged and mowed as short as possible. The rest can be mowed anywhere from 2" on up. With about 40 trees, I'm looking for a ZTR. Ideally, it would switch from bagging to non-bagging quickly, plus changing mowing heights must be fairly quick. Any suggestions?