Teacher Discussion Forums

Hi! I'm new to the forum, but I wanted to see if anyone could help me with this. A friend of mine (a fellow ESL teacher) swears by the ESL DVDs from a company called Video Aided Instruction. He uses them in class and loans them out to reliable students. They seem to have an introductory set (Learning English Steps 1-2-3) and a more advanced set (English Grammar).

So has anybody used these themselves? I'm tempted to get them (they are a little expensive), but I wanted some more feedback first.

Thanks!