Works great! The top cover keeps it well insulated. The phone app to turn on bubbles is a plus. I set it at 104F and in October November in Ontario Canada, temp drops to 99-100F after a few minutes but it stays at that temp for 20-30 minutes. It will probably be too cold to use it in December but we plan to use it again in spring. 2 adults fit comfortably in the 4 person spa without the water spilling over.