Dog Health Questions: Barkbusters Feedback - Dog Training?

Hi I was wondering if anyone used Barkbusters for training their dog. I have a 7 month old German Shepherd cross Border Collie, and I would like some feedback on how it is. 520 dollars is a lot to fork out but it is great that you don't have to pay more if you need extra lessons. Any feedback would be nice!
Thanks

Dog Training - The First Steps in Training a Dog

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I work at a vet and we always recommend bark busters. Out of all of the clients that have used them, there was only one with negative feedback and was refunded her total amount. It was a client that is quite a bit of trouble and just couldn't grasp the concept. For the most part everyone has been extremely happy with their results!
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I just wanted to add that they train you to be the pack leader. It can be a difficult concept to grasp but will have amazing results if you can stick with it.

Dog Training - How to Train Your Dog in 15 Minutes - Is it Possible?

• If they aren't using ONLY positive reinforcement techniques, don't waste your money on it.