I attended a workshop with Howard back in the late 80's. I did learn some things with Howard. I was uncomfortable with his flagrant marketing of his own prints to the workshop participants.
I recognize that like most photographers, Howard has learned some new techniques in the intervening years. His knowledge of unsharp masking developed after my time with him.
I don't know what he charges for his workshops today. At the time that I attended, I considered it a good value.