Did you wet test each of these? What did you think?
Sundance is the name I am more familliar with and tend to lean towards them. They do have a rep for being a quality unit. The Beachcombers, a few folks have them around here and also report being happy. Personaly the pumps in the steps just puts me off abit. Anyhow...
Of these three, I think the the 750 is more comparable to the Optima than the 580 (size, pumps, jets). However, their site didn't give too much informaion on beachcombers specs. Just generic fluffy descriptions. Thermos seal? To me that implies a vacuum,(which I highly doubt, no data on pumps, no data on filtration
I think the Optima is the better of these three tubs, and the one to beat, of these, the next, most comperable tub would be the 780.
I'd wet test. Have you gotten any price info yet? Have you looked around at any others?