Company I worked for in 00-03' had two of them(52"). Solid mowers with no problems while I was there. They swore by having mulch kits installed on them also which is a fail 80% of the time with our conditions and to boot they swore high lift blades were better for mulching then gators. So stupidity aside they were good mowers.
Is the zmaster the 500 series or are they 2 different mowers?
I have a place I want to buy at but his price seems a little steep. The price is right at 9500 for a 60" with a 27hp kohler. seems a little pricey but the service there is excellent. I have been using them for years now and My mower is in and out in no time. they never leave equipment sitting but is that worth what seems to be a $1500 mark up? I don't know