Yes, I have used this system, from University of British Columbia’s Telestudios. I taught one student at McGill University a while ago, as part of an experiment. It was amazing; as though we were in the same room. I am doing one this week for a group of six students in Calgary. The technology at UBC and McGill is state-of-the-art, with three high-definition plasma-screen televisions and high-definition cameras. The images are life-sized, and there is no delay in the sound.