That looks like a chinese made product with a horizontal 6.5 HP honda clone engine on it. Chinese honda clones are pretty good these days, however, I suspect 6.5 horse in a trail quad is totally inadequate. Also, I'm guessing this thing will fall apart around the engine....not to mention the fact that it will be impossible to find replacement parts for this chinese unit.
Motorcycle rider magazine did an article about a year ago where 5 different riders had to buy a bike for around $1200 and ride it on a 1000 mile road trip. Various guys picked various used bikes, but for fun, one of the guys bought a chinese 650 for $1400 (breaking the rules some). Anyhow, all of the bikes made it except the chinese one, which first had issues with the brakes or something similar, but worse than that, the engine siezed at 104 miles. The bike was scrap metal at that point.
There is such a thing as spending too little, and my guess is this falls into that category. For my $900, I'd buy the best used name brand quad I could find for the price.