Right, not in for a debate but passing on gen from people I know who've done it, or certainly from the previous course..
They said that it can be quite "touchy-feely", long days but geared up to recruit people into RM roles. There's a bit of phys but it should be okay if you're not a fat bastard. It's aimed directly for students though, not trained soldiers.
Word of warning though. I was on Ex Airborne Student, we all thought that they weren't going to throw us into test week. Not saying that they did, but prepare as well as you can!
I didn't put my name down because I have shoulder problems at the moment, otherwise i'd have been on it like a shot!