I think a RJ course is a good idea. I am actualy thinking of taking one myself. What these folks on here dont realize is everyone is not super pilot that can just hop from a piston airplane to a RJ with all the gadgets and whistles and keep up with the flow of airline class.
For me at least thats what its about. I know that if I went into a jet class without preparation I would fall behind and probably fail out. So anyway I can get the upperhand or at least some exposure to the terms used and what does what is a plus for me. I am the kind of guy that asks questions if I do not understand and you may have to explain it to me more than once for me to get it. So taking an RJ I will get to ask those questions at my own pace so when I do get to airline training I will have some knowledge of what the heck the instructors are talking about and I wont feel like an idiot asking questions that those 20 something year old fresh out of aviation program universities already know.