I have a question for anyone who has a Q16 or Q20. How reliable is it? I am looking at getting a mid arm sit down, but we are also moving to a more remote area so any repair techs will be over an hour to 3 hours away. How often does it need to go to the spa? Most of my machines are old ones, 1950's and earlier nothing computerized. So I do most of the maintenance myself. I'm a little hesitant on something with a mother board. Also can they be completely powered down between uses? Any help would be great.