I have not had an opportunity to participate in an interactive webinar, but have watched several. I was very impressed with the College of DuPage Press: Soaring to Excellence webinars, that I have seen. I watched a couple of Minnitex webinars and also thought they were well done. It is so great to have instant access to the archived webinars on Minnitex, College of DuPage Press, and other sites.
When I prepared to watch my first webinar two years ago, I thought it would be hard to sit through but I was pleasantly surprised. It was interesting and it was easy to pause and restart the program.