My husband and I are extremely happy with our new Lifesmart Hot Tub.  You can't beat the quality for the price.  We had SuperTub 300 for 8 years prior to this, and this is a definite upgrade with more jets and seating.  We do seem to notice that it doesn't maintain the 104 degree heat when we use the tub, but then again, it has been brutally cold this winter.  The other feature that could work better, is having the ability to view the temperature during the day.  You literally have to cup your hands over the display to be able to view it during the day.  Four people could fit in the tub, but you would want to invite people you are pretty close to, as you will be knocking knees with them.  We like being able to stretch out across two seats, in a reclined position.  All-in-all....we would recommend.