I think this is the crux of the issue. If you have a good, working knowledge of a closely related system then you can certainly learn a great deal. I am currently working my way through the IKCA material at the moment. I havve an extensive background in shotokan and American Kenpo as well as boxing and a few other striking systems. I'm enjoying what I am learning from Mr. LeRoux through this medium. There a few subtle difference in how they do things versus how I learned them but the interaction from the feedback tapes and phone calls are outstanding.
I wouldn't have considered this option unless I already had a solid base of ability. I certainly wouldn't thing of trying to learn a grappling art in this as my experience in that area consists of 2 years of high school wrestling and that was 20 years ago.
YMMV and all that but if you have a good program, prior experience, and partners then I see nothing wrong with it.
survivalist, take a look into the IKCA. Their website is
www.karateconnection.com. Good guys, good kenpo, friendly people. It may not be exactly what you are looking for but I am really impressedd by the organization .
Mark
P.S. I gotta go with Omar on this. A sticky of this topic would be awesome.