They are very legit. I just bought a TM P90 off of there for $232. Also bought a few extra mags, battery and a speed loader. Granted you are going to pay between $50-$100 to get your order shipped from Hong Kong to this side of the States. And they don't offer ground, only express but you do get your stuff in about a week, at least I did. but I had e-mailed them a couple times with questions and they responded within 24 hours.
Hopefully that steal price on that gun you are looking at isn't a STAR AEG. They are a steal for a reason... I have nothing else to say
G&P MK23 - SMP G&P MK18 - STAR FNC x2 - Tokyo Marui MP5 - CA M24 - UTG M3 - Cybergun M&P 9