I have a Gulf Coast Spa that I purchased about 6 years ago. Over the years that I've had it, I've needed to do some minor servicing but nothing major - and all things that I could do myself (as a single woman). I've called the help desk for information many times and found most of the staff were not that knowledgable, but there were a few that were, and were able to assist in providing me with good instructions to complete the task at hand.
I live in central New Jersey and use the spa all year round. Keeping the temp at at 97 in the summer and 101 in the winter, my electric bill is only about $15-$20 per month higher than it was before I installed the tub.
For the money I spent and the enjoyment I've received, I'd say it was a good buy. There was no reason I needed to spend any more $$$$ on a "premium" spa. I didn't need the bells and whistles, just the basics.
I know most people on this forum believe Gulf Coast to be garbage, but I've been happy with mine.
Good luck on your decision!