I have a John Deere 727A mini frame Ztrak. Does anyone else have this same mower or the 717A, that you use for commercial mowing? I was just curious if these mowers are as well built as the other 700 series like the 737 and the 757. I have seen many of the 757's out there with 2,000 plus hours on them, but it seems like every mini frame model I see don't have nearly as many hours on them. So I am wondering if they have different components on them and are not built to last as long. I have 350 hours on mine and I know it should be good for a while yet, but I don't want to start pumping a lot of money into it and find out I should have traded. I always perform all maintenance on it, and it has not give me any problems yet.