it has nice specs and quality parts which is not normal for china. you made a nice find there.
i would not buy through them for 1 lamp only though. Why? Shipping electronics from china is a logistical risk. the chances of having a partial or full DOA is much higher than ordering the lamp from a different company in the US. If your ordering for a room that requires multiple lamps i'd say take the savings and use it to buy some extra lamps just in case you find yourself sending one back to the manufacturer for replacement. since your talking about dealing with a Chinese manufacturing corp, your turnaround to get the lamp back from them is going to alot longer than their american competition.
TLDR: if you need lots of lamps, do what your doing and research for the good china stuff. if your going for a single lamp tent grow then i'd suggest spending the extra 75-100 bucks and just be glad that gotham and solarstorm kick so much ass on tech support