We have the Chinese and Japanese versions - my son loves them (when he's in the mood for Chinese or Japanese at least!) but I can't say anything about English. I am seriously tempted by the new pack of flashcards they have released to go with the dvds, but will have to wait until I have another baby as my son doesn't really need any more learn-to-read materials
If you become a member (for free!) they have member's offers and also periodically send out discount coupons - the best I remember was 40%