I use it as well and agree with everything being said. I never put more than one, or two at most, coats of wax on. I really like it for putting rub on waxes on the ski (such as Dominator Butter spring wax). With my 1 coat, I find it will last a day at most. I usually get 3 days out of a hot wax. Its much easier (more rubbing, though) to do than a hot wax and uses less wax. Essentially no waste. Maybe if you put 3-5 coats on it would last longer, but it seems to me the penetration is not as good as what you get from hot waxing, so it doesn't last as long. It is perfect for a racer, who only needs a few races from their wax job. Very popular item on my race team. Its definitely worth the price, but I use it to supplement my hot waxes.
I know Mike and give him a lot of business. His grinds are usually perfect, best looking bases I have ever seen. He told me that heating skis with iron's can only deform his perfect grinds and eventually degrade the skis. He takes serious pride in his work. I think there is some truth to that if you overheat your skis while waxing, and hot boxing I avoid because it does heat the entire ski. If the temp of the iron is kept as low as possible, it should be OK. Again, for race skis you are looking for 1 season so do what makes them the fastest.
To answer your questions: the glide is equal to hot waxing from my point of view, but it doesn't last as long, just as everyone says. It is quicker to do and easier because it is less messy. The rubbing is about equal to the scraping, I give it a tie on that. I have used it without brushing and it works fine, like he says in the video. A little slicker if you brush. the product is indestructible and will last. I havae used it for 5-6 years and still have the original cloth on it. It does mix some of the old wax on the cloth with the new wax on the first couple of rubs. I never clean it.
I have a cork block with rounded edges. It is pretty much the same thing except the cloth on the wax wizard holds a little wax and spreads it a little better. I forget how much I paid for the cork block, but it works pretty similar.