Larry,
There were a couple of bootnecks on the course I did with Kingswood. Very well set-up place they have there in Kent - give Richard Olley a call if you want to know anything more.
I can't speak for anyone else but the Kingswood course was geared towards making sure you got all the relevant ground and aerial basic tickets and could effectively pay for 95% of the course with your resettlement grant, SLC and ELC.
Whilst you might get more out of a college course in the long term, it depends on what time you have left in the Marines and what activities you have coming up. Many civilians do not understand that it is not a simple matter for a serviceman to sign onto a college course part-time or evening classes - regular attendance can be difficult.
I agree with what someone said above about maybe doing a couple of weekends work experience to ensure it's what you want to do. Check with your RAO over what the score is with insurance or, alternatively, just do it and don't get injured.
If you want value for money, then something like the Kingswood service-leaver course is excellent; however, it is getting increasingly difficult to get experience once you have your tickets: I've been doing work for friends and family just to keep my hand in and have found it extremely hard to get any weekend work with a company, even when I have been offering my services for nothing (yes, I said 'FOR NOTHING!', Poole area, Dorset, CS 30, 31, 38, 39, woodchippers, stumpgrinders, clean 1992 driving license, own saw and all own PPE and climbing kit).
I would echo what someone else said earlier that now is not a good time to leave the forces. I don't know your discharge circumstances or options but, if you can sign on for another year or two, and spend that time looking into courses, doing a bit of work experience, not getting shot in Lashka Gar or Goresh, etc, it would be time well spent, with money in your pocket and a roof over your head.
I'm due out in Sep 09 - I'm kakking my pants and seriously thinking about doing another year instead...