Well... got the first 2 hydro bills in and it LOOKS like operation cost is going to be around $50 a month... about the same as running the AC in the summer, which is manageable... although outdoor temps have been above normal.
I was worried about shift when the ground froze up but it appears all has settled pretty evenly. One corner did drop about 3/4 inch more than the others though but still doesn't seem to pose a problem. I am having some icing issues though. When I open the lid on the colder days for any length of time I get ice forming on the top edges of the tub so the lid no longer closes properly. You have to melt off the ice first. I may have to run heat tape along the edges to avoid this issue.... but overall that's the extent of the problems. Well... that and the little one asking if we can go in the hot tub EVERY 15 FRIGGIN MINUTES!