It's been 5 1/2 months since the delivery of the spa and it's been a good experience so far.
I've had 1 recurring problem with the tub - the Waterway jets keep breaking. The tabs that hold them into place break off and the jets pop out. So far I had 5 jets break in the time that I've had the tub. The dealer who's 45 minutes away has been good - she's mailing the jets to me and I mail the defective one back. Of course that's at $3.50 a pop return postage but it's better than driving there and IMO the tub is still able to be used. She claims that they'll be covered for the full 3 years.
Unfortunately (or fortunately - depends on how you look at it), I'm the only person who really uses the tub so it's a huge tub for 1 person. I do try to use all the seats that I fit into (I don't fit into one seat) and after 50 minutes or so come out feeling great.
Other than the jet problem the tub has been great - electric cost has been about $40 a month in the summer months at $0.14 KWH and I did use it about every day. When the tub was new, my youngest would go into it and turn on all the pumps - I would imagine that without using all the pumps, cost should go down. Also, this includes dumping and heating the water 2 times during the summer.
The neck jet seats don't get used too much as I don't fit into one and the other I use whenever I want a neck message - I actually thought this would be my favorite seat but I find I go into the seat between the 2 neck jet seats and get most of the message from that seat. I only use this seat whenever I want the top of my shoulders to get massaged or get tired of the rotating jets.
The tub has 2 deep seats that have been great when it's cold and windy (25 F and 30 MPH winds). The deepest is the neck jet seat - it covers my entire body and only my head and neck are out of the water and the next is on the quasi lounger - the tops of my shoulders stick out of the water. The tub also has some shallow seats with the lounger portion with the seat jets is the shallowest.
Overall it really is a great tub, and I would recommend it to anyone. I will say though you really need to test the neck jet seats to see if you fit under them. As I said previously, I did a dry test and it felt differently dry than wet, it can keep you locked into the seat and it takes getting used to.