There is one comment on them in this thread:
http://www.337skymaster.com/messages...ight=Recurrent
In addition, I have used them 3 times over the years, and I have always felt it was an excellent value for the money, that I received very good training, especially the first time you attend. Their simulators are not perfect representations of Skymasters, but the are CLT, and are very good training devices, in my opinion.
Lastly, they are reviewed in last month's Aviation Consumer, if you would like another opinion.
Kevin