there's already a bunch of reviews for this bike, do a search.
my lil bro has one, it's a solid bike for the price and he never has any problems with it, only needs the usual upgrades that all cheap china's need,
for $800 with a spare parts kit this bike is the best value in it's price range, the only other bike I'd buy for around this price is a DHZ140 but that's $200 more