Hi Don - Never heard of Shoreline Spas. From what I could find on the internet they are made by a company in TN that makes several lines of spas including River Ridge Spas, Garden Leisure Spas, and Dynasty Spas. If you go to Garden Leisure Spas website they look like the same spas as Shoreline - probably sold in a different region.
http://www.bbb.org/chattanooga/business-reviews/spa-hot-tub-sauna-sales-and-service/garden-leisure-spas-in-athens-tn-40012647Hopefully others here will know something about these spas and speak up. What I would recommend is shop around and wet test. If you come by the Twin City area you have all the major players (Hot Spring, Marquis, Sundance, D1, Arctic, Bullfrog, and Jacuzzi) and probably more.
I am tired of this MN winter as well. I'm hearing some people referring it as S'winter - LOL!