I just finished Park Tool classes. They cost me seventy five dollars and I got a twenty percent discount on parts and tools. The way they did it at my LBS was you took your own bike in and gave it a full tune up. Total disassembly/reassembly. There were three students in the class, myself included and we had an instructor and an assistant. They were very patient and fielded all questions(no dumb questions). One of the really interesting things was as we had an instuctor and an assistant we were sometimes shown more then one way to do things. The most interesting part though was at the begginning of the class. They didn't tell you how many sessions there were going to be. I asked the instructor how many classes were included. His response was that there were seven chapters to be covered. We could run though it in three hours, but you wouldn't learn anything. We will take as long as we need for you guys to learn the material, so the length of the class depends on you the student. I thought that was really awesome and he was true to his word.
I am at least somewhat mechanicly inclined, but with what I paid for my road bike, I wanted to make sure I was maintaining it correctly. I learned a ton in this class and will now do almost all my own work. There are a couple things still best left to the shop. If your going to invest what I would consider to be big dollars in your bicycle you owe it to yourself to take the class even if you have no intention of doing your own work. At the very least you will know whats going on with your bike and when you do take it in for service you'll be able to tell the bike mechanic whats going on.
I highly recommend this class.

Jim