I saw this and thought, ""ok great! one button for two what could go wrong?"" Well I have two hot tubs- one for a place I do short term rental. I'm all about simplicity and thought this would be a win. The problem is that if you hit one of the buttons too many times it goes into program mode and when you've had a few beers and are enjoying life you inadvertently put the tub into weird modes. The LAST thing you want is problems and late night calls as a short term rental host- I would give this one a hard pass and go with the tried and true, drunk friendly 4 button topside. one button for hotter, one button for colder: one button for lights on or off, one button for jets on or off. SIMPLE . This topside has created more grief than I care to share.