Does anyone have any experience with this? Problems/issues? Benefits (other than not having to hear a jet engine start up when the heating system kicks on)? Cost? How long do they last in the real world? I'd hate to set my heart on one of these only to find out after the fact that I need to smash my basement floor every ten years. Also considering masonry heater. Maybe a combination of masonry and radiant subfloor with PEX. We'll see.