I have been looking at different spas and been very impressed with the Coast Spa Unity model. It has great jets and the double lounger is nice along with the shoulder jets. I have not physically looked at a Hydro spa but have found one that from the specs and pics. on the internet it may be worth investigating. It is the Mark III series and the Omni model. This will be a first time purchase and I would like to get it right the first time to avoid a do over in a couple of years. Any advise and opinions would be appreciated. I am also open to other models, my main requirements at this time are a lounger, good jet action, and shoulder jets.