I did the course earlier this year, thoroughly enjoyed it, it's well worth doing. It's endorsed by the Royal College of Surgeons of Edinburgh, so the qualification is worth something. The guys teaching have loads of experience, have been there and got the t-shirt, so they know what they're on about. From the sounds of it, people from all sorts of backgrounds have done the course and found it a worthwhile experience, from us students up to very experienced doctors.
I think the way we did it was slightly different from normal, but the training was really good, and the simulations excellent too. We were really chucked in the deep end, which made us learn fast. I've not yet been in a position to properly use the skills in anger, but on my next placement (I'm a med student) in a busy A&E department I was able to jump straight in helping in resus, and it put me streets ahead of the other students there. I'm also confident that I would be able to do a decent job if I came across an incident when in the middle of nowhere.
Our supervising consultant is well respected in A&E, and he thinks highly of the course.
We all came out of the course massively more confident, able to approach situations in a good, logical manner, miles better at navigation, and we really gelled as a team.
Only downside - would have been good to do the earthquake scenario more than once
If there are any specifics you want to know, just PM me.
If you google (or there may be a link from the exmed site, I can't remember), there is an article in the BMJ about the course written by a doctor who did it before she went off on some cruise ship or some adventure or other.. can't remember what, n too lazy today to check, sorry! But it will tell you more about the course.