You're probably better off buying an AntMiner S1 and getting delivery right away. Minersource carries those and posted a pic a few days ago of pallets full of them. The X-1 delivery won't happen until May -- if you decide to go that route I wouldn't prepay at this point -- wait and make your decision then depending on difficulty, etc.

To your point, I think other than one prolific poster here, people tend to feel bobsag3 is legit. He's been in business quite a while and does hosting and sales. The guy disparaging him here hasn't turned up any disgruntled customers, just a steady stream of minutia.