As everyone said, DO NOT buy without wet testing several spas. Many brands are starting to add stone-look siding to their line, which may look good with your landscaping. Look for ozone, it makes a difference. Mine is usually just for me, but my kids come in on weekends. We also use it as a little pool here in FL, so the air pump helps cool it down.
I was so sure I wanted a lounge when I started. I found I floated in every lounge. In fact, I floated in many seats, or the jets pushed me out of the seats. The only spas I could enjoy had either the foot dome or the ridge like my Caldera. I chose my Caldera for these reasons:
1-the foot ridge
2-no foot dome....although I like them, I really like the open floor, and use it a lot. Sometimes I sit down in the floor well! I have a great foot jet on the edge of the floor.
3-the open seating....I love to move around from seat to seat, but I still have one captain's chair w/ neck jets. I also can put my feet up on any seat, and make my own lounge.
4-the cool down seat, both for my toddler and for cooling down!
5-the variety of seating heights and jets
6-the mini lounge-it doesn't take up the room of a lounge, but you can sit in the foot area (I love the foot jets on my butt!...I know TMI)
7-the external lights that cycle w/the internal ones. I love that.
I am not trying to sell my spa to anyone, I'm just pointing out the things that were important to me as I looked. Had I not wet tested, I would have ended up buying a spa that I really did not enjoy being in, just looking at.