Mark,
I'd go for it if I were you. I've been to several workshops and the experience has helped me alot. You learn not only from the person putting on the workshop, but also from the attendies. You will meet people of all skill levels at most workshops ,Pick thier brain and you can learn lots. I've found that the models are a much higher calibre then I find in my area and working with them also teaches me alot about posing.
Mark Harper
A workshop photo