thats also another problem with these - the pump is built into the unit itself. go for a lazyspa if you can
I had an MSpa hot tub, the circular one Silver cloud I think. It lasted all of two years before the pump unit (which is built into the inflatable) died on me. That was with it only being run during the summer and being packed away in the shed for winter. The build quality is pretty cheap. Replaced it this year with an Intex Spa and I'm much happier with it, build quality is much better and the pump unit is separate so it's easy to detach the pool and clean it out when I change the water.
My cat drowned in one of these - Cold.
This thing once heated up hardly costs you a penny. Very well designed and a cracking buy.