GGOSLER,
So how many hours have you got on that Gravely now? I just bought a step up from the ZT HD(a 52" Pro-Turn 152 XDZ with the Kawasaki FX series engine) because I wanted an entry-level commercial model. These Gravely's are designed to mow 500 hours a year rather than the 10 years it took you to put that on your JD, so you'll be hard pressed to wear that puppy out in a lifetime. I agree with you...the Arien Company has made some fine ZTR's for years(my neighbor has a 48" he bought 15 years ago and it still cuts his yard like a golf course), but their acquisition of Gravely a few years ago added some top notch commercial quality machines to their product line. I have no doubt that my 6-yr-old grandson will be cutting his grass with my Gravely long after Grandpa is gone!!
Currently have 32 hours on my Gravely, each time I get to use it is better !