Karl, the course was over 8 hours of classroom and two dives.
Cornfed, yes the next ANDI course is Technical SafeAir Diver, which covers stage stop required, decompression diving to 165'. I'm not sure what that is equivalent to though.
I had a choice of doing the LSU (EAN32 or EAN36 only) or CSU (up to EAN50) courses. After speaking to the instructor at some length, he recommended the CSU course and I would have only ended up doing it at some point anyway.
I'm a newly qualified diver and did the CSU course at the same time as my OW, I actually dived Nitrox on two of my OW qual dives, as they were also my CSU qual dives. I'm sure some may say this was too soon, but I was sold on Nitrox and wanted to get qualified asap and the instructor was comfortable with me doing it this way, although he sometimes will make students wait, or do the LSU course first.
For me the CSU was my "basic" Nitrox course, and part of my "recreational progression", and was followed shortly by AOW. While on the subject of AOW, I found the CSU course to be very in depth, useful and infortmative and my diving knowledge increased considerably. Whereas the elements of my AOW (SSI), deep diving, boat diving, navigation, computer, where very basic and while I did learn something, most of it appeared to be common sense. If the Nitrox training I received would have been at the same level, I would definitely say it would have been too basic for what certainly appears to be a complicated and detailed subject.