We replaced our old four plus person spa with this two person spa.  It has plenty of room for two and uses a lot less water.  It is well isolated so there was little impact on the electric bill.  It is wired for 110V and 220V  I have not had time to hook up the 220V but it is working perfectly on the lower voltage.  Very please with this spa.

Pros: Well isolated, uses less water, and is roomy for two large people. 
Cons: Could use a couple of head rests.