one of the biggest things that is over looked is access to the plumbing or any other parts in the spa. I'm not saying that there all going to break and leak but thats like buying a new sled and saying its never going to have any problems. Stay away from a spa that has full foam insulation and no way to get to anything. I can not tell you how many hours I have spent digging out foam looking for a leak and at $85 an hour that adds up fast.