I know Engadget is now using it for a review, and apparently it has issues with Verizon SIM cards, I've actually received more information from the Writer at Engadget than from KnowRoaming itself.

You don't really use it in your home country, since it's designed to stay dormant until you roam. The bigger issue now is the disdain that KnowRoaming has treated several of their customers with. I kind of hope they end up going under and someone buys their idea who can run the company better.

I've been doing some research and came across Bibitel tonight, (www.bibitel.com) and it seems they have the same idea, and the product is already on the market.