This is the only review I've seen on them:
Stay Away from QCA
by racinref,Dec 09 '04
Pros: Originally a fair price. (But not in the long run!)
Cons: Terrible customer service, and poor quality product.
I have had to replace 2 jets, an o-ring, a pump, and 2 heaters already. But the kicker is when I needed a 2nd replacement heater in 18 months on my QCA spa, I called the local dealer. They were not providing any service or even calling me back, so I called QCA who agreed to step in and take care of the problem. After they offered to replace it under warranty, and I did all the work replacing the heater, they charged an unauthorized amount for the heater to my credit card, and changed their story saying the heater was not warranted after all.
While I enjoy having a spa very much, next time I will do my homework and get a good one with a better company behind it. I would never recommend QCA to anyone. You have been warned.