To summarize the thread so far, we have 70 replies. Two of them are from people who have actual first-hand experience with the unit:
and
Then we have 68 responses from people who've never seen it with their own eyes but are sure it's a piece of junk.
The HF website also has three reviews from (presumable) owners and they're all positive.
I'm willing to believe that the quality is comparable with a rider mower that you'd buy at a big-box store. I'd imagine that on a $2,000 rider the deck contributes about $400 to the cost, and this is basically a mower deck. While a $2,000 mower is obviously not going to be as durable as a $10,000 mower, for the vast majority of people it's a far more sensible purchase. There are lots and lots of people who buy a big-box mower and use it an hour or two a week for about 20 weeks a year, and get ten or twenty years of service out of it. That might be a lifetime of 400 hours of operation, which wouldn't even get you through your first summer if you were a landscaper, but is all a homeowner needs.
It's not like there's a lot to a mower anyway. Gearbox, belts, spindles and blades. The gearbox looks like a standard 40HP unit that you can get on Ebay for about $200.
My experience is that HF has good parts support. My experience with American brands is not always so good. In 2007 I bought a Woods rough mower. Last summer I ran over a big rock hiding in the grass and broke the stump-jumper. According to Woods that piece is no longer available and they had no replacement. Fortunately I was able to get one off Ebay, but it didn't leave me much faith with Woods.