I have had many riders and WBs and yes I made bettter time on alot of lawns but if a Z was down and we used a WB on the same lawn it was night and day difference. I had several customers in the same development request we use a WB and I told them it would be $10 extra per cut and they never blinked an eye. I sold all the Z mowers and even bought a new Bad Boy last year to help with a couple of larger lawns to cut down on time the cut was good as well but on a 3 acre lawn with tons of trimming the 60" Z only saved about 25 minutes over a 48 belt WB. So we sold the Bad Boy a few weeks ago and just picked up 2 Bobcat Hydros with Z controls and still have 2 48 Exmark belt drives. In my area most lawns are 1/2-3/4 acre of turf and the Zs save some time but I can make the exra csah up as most customers use me and another very large service "Wetlawn" because we dont use the Z Riders. I lost 3 customers in 1 year using a Stander 36RH because of rutting that it did so it had to go. I have been mowing for over 10 yrs and started with WBs and have to say I will stay with them.