So, Patrick Le, aka patrickle168@yahoo.com, aka rotorconcept@hotmail.com, (626) 448-8888, 2646 Durfee Avenue, #188, El Monte, CA 91732, http://www.rotorconcept.com goes to tradeshows, like aviation tradeshows, and demos reasonably cool RC helis or quadcopters.
They sell things like ID1-SWAT COAXIAL HELICOPTER or the Rotor Concept HPQ1. When I ordered the latter, this is what happened:
I don't think Patrick is a crook per se, but he clearly doesn't care about doing his job right, charging the correct price, shipping what he sold to customers, fixing his own mistakes right away (not three weeks later), or doing timely customer support.
Long story short, he's a disgrace to the RC community, if my review didn't convince you, got read other reports on better business bureau: http://www.la.bbb.org/business-reviews/Toys-Retail/Rotor-Concept-Inc-in-El-Monte-CA-100105435
In my case, I called my credit card to dispute the entire charge and get a full refund since he failed to reply within 3 months, which hardly suprised me.