I appreciate that personal vetting is something which you feel necessary to ensure a good service but what about the risk of opening yourself up to legal issues if an attorney you have vetted then provides negligent advice?
I would argue that personal vetting has created a duty of care which would not otherwise be present if you simply relied on the State Bar's database.
I imagine you have thought about this and the risk of the above is outweighed by your desire to ensure a good service but just something that sprung to my mind.
What does this site/service do better than existing, established players?
What unique benefits does this site/service provide that the other sites do not?