I've had an Arctic Spa summit for 2 years (3 motors)
We overall love the spa for comfort, winter use (in Montreal) etc... We use it still more than we thought we would - just getting out from a 2 hour soak with friends.
However as of right now I would not but another or recommend another to anyone for the problem we have had with the components and electrical parts of it - both ability to actually control temperature and the fact it is not able to run even a 30 minute filter cycle without turning on and off. It is a more expensive spa and I would expect it to function as such.