Tropic Seas is a May Manufacturing product, IE Artesian. Artesian and it's related spas are a solid value and a quality brand.
Looks like Specs and such are very similar to the Island spa line, which is a good upper mid level tub. Less bells and whistles than The Artesian Elite or Island Elites but better than the South Seas or Garden Spa lines.
I have an Island Nevis coming any day now which I went with after months or research.