I was looking at doing the same thing, so I'll tag along here...
I know where these Chinese guys are located in Shenzhen. Don't even dream of getting these on time if you get them at all. That's all I will say.
Black Arrow is one of the few companies that has consistently delivered products on time and have been very transparent in their business practices. And if you are worried about buying directly from china, bobsag3 here on the boards is a US reseller for them. http://www.minersource.net He is also a part of the DZ miner co-op which has tons of Black Arrow bitfury boards hashing away as we speak.
As far as ROI goes for the X-1, that is speculation at best. I personally do mostly scrypt mining at this point but I did order one X-1 for the hell of it and I expect it to probably break even and mabey make half a bitcoin in profit at best depending on where difficulty is at by the beginning of march.
