This spa is a great value for the price.  If you are looking for a basic spa that performs well for a low price then this is the one for you.  We have had ours for about two months.  It does a great job of maintaining 104 degrees thus far, with nighttime temps around 40 degrees.  The jets have good power, not great but better than I expected.  The appearance is also better than I expected for the price.  Very comfortable for two people (that's us) and probably a little bit crowded for four but certainly doable. 

Pros: Value, price, jet power, does well maintaining temp without heater
Cons: none