It's quite a bit more than an extension. The ammount of code these guys have written to make this happen is unreal. The webmaster over there spends a heck of a lot of his time answering questions and pushing the product forward. It's a free add on if you wait untill it's released, but IMO it's worth it to help support someone that has poured so much time into something. I know after the many many hours I have spent on my site I would welcome a small donation for my own effort...
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