I've used him in the past with no major issues. I did find it difficult to reach him at times when trying to to get updates, but he was just slow responding.
Just a friendly word of advice stay FAR FAR AWAY. If you are working for Bob 90% chance you wont get paid. If he is hauling for you just about 100% he will use a lease operator and he runs them for a couple of months till they quit because he wont pay them either.