There are some members here who took Sheridan options courses. Just do a search and you will find many topics mentioning him.
Here is some more info about Sheridan Options Mentoring program:
Sheridan Mentoring reviews
Sheridan Mentoring Administrative Fee
I myself went through the program. It's a good program, but pricing has changed significantly since then. I would pay attention to a small print.
Here is another good discussion comparing different options and alternatives: http://forums.capitaldiscussions.com/threads/looking-for-guidance-sheridan-options-mentoring-smb-u-or-john-locke.366/.
My biggest concern would be if you currently get good value for money. The program used to be 6k for lifetime membership including 12 one on one mentoring sessions and ALL new and old courses included, with no extra fees. Today all programs are limited in time (no lifetime membership anymore) and the gold program is much more expensive.
Overall Sheridan Options Mentoring is a good options program. They always have been saying that options trading is a hard work and you need to practice the craft a lot before you can become successful. They don't promise any shortcuts, only hard work. I share this philosophy very much.
Unfortunately the community is not what it used to be. Many veteran members left and the discussions are much less intense than they used to be. So you need to decide if 7k is a good value for mentoring only, without the added value of the community.