I did take Bill's class at Herrang last month, so I believe my knowledge is fairly up to date. It was a 4 part connection class that was open to all levels. I found it extremely useful and I know many people found it this way as well. He focused very specifically on lead follow technique. Ways to improve connection in using specifice muscles to lead, posture, alighnment and also strategies and what not. Bill does prescribe to certain rules in his dancing, whether you agree with them or not is your call, but after a month, I have started adapting many of the things he taught, ie the way you open up at certain counts in the swingout, the way you position your arm, the way you have hand contact with your follow. After practice and some thought, they did make a lot of sense to me. Most people I talked to who took the class found it useful, this included many advanced dancers as well.
So, it depends whether you think this stuff is important, outside of Paul And Sharon, Bill appears to be one of the few lindy teachers who really focus on the minutae (and I mean that) of partner connection. Other classes focused on compression, topics for follows on how to react to a lead, etc. etc.
So based on my recent experience I would recommend it. And even if you disagree with his teachings, they will make you think about what you're doing. Some people thought his was one of the better classes at the camp, and there was many arguments about his techniques both pro and con so he definitely generated discussions
As for his personality, he can be a little direct and harsh at times but I found him to be a knowledgable teacher.
PM me if you have any other questions.
-jeff