http://www.kopterworx.com/. Having a bit of a crappy time with these guys so far. I bought a droidworx CX frame from them which they advertised as a CX V3 Here: http://www.kopterworx.com/CX-Series/CX-4-V3 - They've changed the wording now since I complained to Droidworx directly. They sent me a CX V1 instead, so not such a great bargain after all. This is their first email reply after I sent a message saying they sent me a V1: "Please send me picture. And i will chekc. It should be v3 but not titanium version." I sent them pictures of the obviously V1 landing gear (other versions are quite a lot different) and the frame. Their next reply: "WIll let matjaz answer this email. Give him some time since he is in tailand. With Best Regards Dejan" After this I told them what the guy at Droidworx said: "'Hi, Can you please contact Kopterworx in regards to your V3 CX. I'm not entirely sure what they have sold you. It isnt a CX600 (i.e. V3), so its likely a V1 with some type of customization on their behalf." After which Dejan replied: "Hello, i told you we dont have cx600 at all. Only the v3, the one before the cx600 series. Maybe there is some mistake and its v2 but there was some update after this one. Also we have some v1 on stock and our shiping send the wrong one. Please wait for matjaz to come back and he will sort it. With Best Regards Dejan" I replied: "Hi, I don't remember you mentioning you don't have the CX600 anywhere? The one before the CX600 is the V2. Best wishes, Jonathan Malory" Then lastly Matjaž has replied: "Hello, Well you got the v1 version. And it was our mistake since we had wrong information on page. We cant give you the v3 version since we dont have it. So please send us back the frame in original packaging and we will refund you all the money + shiping. THis is all i can do atm. That is why this item is on discount and is about 300 eur cheaper then the new cosmetically improved cx600. This is stock and no modification was made ot it. Let me know on how we will continue this. With Best Regards Matjaž Kranjčevič" My last reply: "Hi, Hmm, I started building it now and want to finish it, so I guess I'm stuck with it. Guess I will know better in future. Best wishes, Jonathan Malory". Thing is, I don't even mind that it's a V1, just don't like all the runaround malarkey and being told something is what it isn't.