He might be busier right now. One of my friends mentioned that he didn't react as fast as he expected. But his case was approved in 6 months. VSC speeds up a little bit already.
Write him an email, attch your CV and he will provide you a free evaluation. If you decide to hire him, the payments will be split into 3-4 parts, I forgot. And he will take care of everything with no more charge until you get your GC.
I felt that he is an honest guy, and not greedy at all. In my city, attorneys' even charge for a certain amount for just helping you fill in I485 and EAD and AP application forms. They don't include everything in the service fee.