Stay away from anything built by MG. They make Troy Built, MG, Briggs and Stratton, Stiel chain saws, and much more. Many of the names used to signify quality, but now much of what they make is crap. Spared are very slow in coming and the quality is way down. They used to make Cub Cadet but I think the employees bought the name and the quality has come back.

My brother mows commercially and uses a Scag; very expensive but good. I just bought a $2,500 John Deere for the church and although it only has 20 hrs. on it it seems like a pretty good mower.

My neighbor tried out a zero turn Gravely but found it very rough ridding. He went back to a Grasshopper.

Sears make a good ZT machine and has a good warranty.

All the zero turn movers are basically the same mechanically. They mostly use the same kind of hydraulic motors and valving. It mostly boils down to what kind of warranty you can get and how close the nearest service is.

If you go into Austin of some other reasonably big town go to the better sections and see what kind of mowers the landscape companies use. Remember that you are not going to make your living off this machine so there is not need to spend $8k when $2,500 might do as well.