Has anyone here ever installed a retractable cover? We live in Pennsylvania and travel to the West Coast in the summers, so we would love to have a pool to use in the wintertime here for health reasons. We'd have to build a whole separate building, but have been looking at retractable covers, in particular Covers In Play. Has anyone had any experience in this area? Just got a bid on the pool last night, and would love to sign on the dotted line, but the pool will be useless to us unless we find an economical way to cover it for winter use.