I've been sitting in Juval Lowy's .Net master class this week (3 more days to go) and I can say a few things about Juval:

1. He is a brilliant systems developer and architect
2. He knows his stuff
3. He does not like interruptions in class, so if you're uber sensitive and like to make jokes and ask questions like I do, you might want to take care
4. He lets everyone know of the first points
5. If you have a question, he will most likely cover it in the next slide or so, so shut up
6. This is worth the money