We have only used our spa twice.  We enjoy it but it is very, very slippery and hard for us to stay in one place.  No problem getting in and out, and easy to operate and assemble.  Just wish we could fix it so we didn't slip and slide.

Pros: We had trouble with delivery service.
Cons: Our only complaint is that it is very hard to stay seated.  We haven't tried four people I. It yet, but most likely it will be pretty tight.