I haven't used a Hustler, but I've used various big mowers. I'm still mystfied at the ridiculous mowing speeds some of these mowers are claiming. Unless you're mowing only 1/2" off all the time, I just do not understand how you can get clean mowing results at 13mph. And obviously, the smaller the properties you're doing, the more turning you're doing, and the less you're really able to use these high speeds. Toss in hills, wet conditions, etc, and just how often are you making use of this extra top speed? (which often comes at the price of decreased control sensitivity, higher weights, less turf-friendly tires, etc)
They all seem to be well built designs. But I'm not buying the claim that theoretical production numbers in any way represent what's really possible in the real world.
Finally, some people's idea of a "great cut" is anything that doesn't leave lots of stringers. I see lots of large commercial properties that look fine from a distance, but when you walk the property you notice the windrows of clippings matted in the lawn. I want a mower that cuts reasonably fast but does it very well.