In reply to christopher m smith:
Plus points:
Instruction is excellent
Accomodation is good
The courses are generally not so serious and are fun
Minus points:
On a course you may get stuck with someone who has lied about their competancy, is having a bad week or with whom you do not gel. On one 'more advanced' course my companion could not even tie in to his harness!!
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Other points:
1.) The Rock Improvers Course I would not recommend (introductory and leaders courses were very good) as the ratios early in the week make it far from specific to your needs
2.) I would go again, if I was taking someone I knew with me, but would consider it carefully if not.
3.) We have always ended up making long term climbing friends despite the distances, although this perhaps has just been serendipity.