One big difference between them is the warranty on the Rendezvous will be longer than the others. 5 years parts and labor on major equipment and plumbing, 7 years on she surface, and 10 years on structure. I think the Hotspring is 2 years on equipment, 2 years surface, and 5 years on structure. I own a 2008 Rendezvous and it's a great tub. Very energy efficient and easy to take care of the water, I run mine on 110v but you may want to go 220v if you're in a colder climate. I use the SpaFrog system and it's super easy to take care of the water. It's always crystal clear and very low in chemicals (I don't get out smelling like chlorine).