I just ran across the MagnuM Countryside 3502 and was wondering if anyone has had any experience with them? The local dealer I have been talking too is really pushing the Mt Vernon because it can go into my pre-fab fireplace without too much hassle. The Magnum looks very similar in specs, and is about 2k cheaper, is there anything I should know before I contact the dealer? Will it even go into my pre-fab fireplace?