Sundance stopped making the Montego shortly after 1999, but it's basically the same thing as the Bahia (their Sweetwater brand), but with the air blower system and a few other features.
Let me start with the dealer- All Seasons Spas in Hilliard, Ohio. If you're in the central Ohio area, you owe it to yourself to check them out (online at www.allseasonsspas.net). Mike, our salesperson, was extremely informative and helpful. He didn't just sell us a spa and ask us where to deliver it- he talked over a variety of installation ideas, helped us plan out a deck, and even recommended a local deck builder and electrician to hook it up! The deck delivery and installation went like clockwork. I'd definitely recommend them.
Anyway, about the spa. My wife and I decided to get a spa because both of us have stressful jobs that keep us on our feet all day. In wet testing, jets that massaged our legs and feet were a must. I had also done a fair amount of research, and read that many people buy spas with lounges, and then end up not using them- second time spa buyers usually buy spas without loungers. With those ideas in mind, we tried out Sundance, Marquis, and Dimension One. While all had their benefits, we definitely liked the foot dome in the Sundance, and the lack of lounges was a plus (we found that we floated out of all the lounges we tried).