Has anyone else had any experience with the The Hearth Kitchen Oven. Its a brick over insert for a your oven. My sister-in-law swears by hers and is talking me into buying one. Anyone have any experience with this product? The company I'm working for designed a site for them and they are on sale until the 25th on the site advertised in the infomercial cheaper then anywhere else. http://www.hearthkitchen.com/ Any advice outside of the family that have used it would be greatly appreciated.