I tried paying for some of the advanced lessons, but they're not accepting payment for some reason. It's a shame, because I think there are alot of people interested in using their service. If anyone has had any success getting the in depth lessons, I'd like to hear about it.
I've written to them in the past along with alot of other people and they've never replied. They have a discussion board and it's been brought up a number of times. I haven't tried purchasing anything in the last year, but I don't think they're accepting any money. Hard to imagine.