This is actually a lower cost/ quality model than the bike I was riding and can be had at an even cheaper retail price in China. I'd say that if they're trying to sell these bikes for anymore than 500 bucks in the states that people should stay far away from them.
One of my coworkers here in the PRC bought one of these bikes and has had nothing but trpouble with it. The bike did save him a few bucks in the begining but has caused more hassel than what it is worth.
Also the chrome fenders and chrome parts on this bike rust quickly and it would be better to get a bike that is painted.
There is also another version of this bike that is not a step through but is still a 48cc bike. I'll take some pics of my coworkers bikes when the rain stops so you can see what else is out there.
Mike