I did the Dirt School jump course 2 last weekend with Andy Barlow. Thought it was very good – Andy in particular was excellent, great teacher. It was predominately set in the freeride park there, which was a good spot for it.
I did the course as someone with really no experience of getting the bike off the ground at all, and learned a lot. I still can't do much, but feel that I understand how it should be done and it's now a matter of practice. Put me on the right track.
There were a few others on the course who were a lot further along than me and Andy seemed to do a good job of tailoring the class to each rider's ability. I guess you'd need to hear what they thought of it though (I noticed one of them had MTFU written on his bike so it's possible he posts here). That's probably a strength of dirt school – the teachers are properly advanced riders so can cater for the full spectrum of abilities.