Use your visit to experience the hot tub, touch and feel them and make considerations.
Jets: how do they fell when in use (ideally during a wet test), are they adjustable and if so how adjustable, do they match up with high tension areas on your body?
Seats: jump in and try the seats, even in a dry hot tub you will still be able to tell if the seats are comfortable and not too big or too small
Listen: how loud is the hot tub when the jets are running, how loud is the circulation pump when the water is filtering, how good is the stereo?
Use: how easy is the spa to use, is the control panel simple and user friendly, how easy is the control panel to access from inside the hot tub?
Maintenance: what chemical treatments does the dealer recommend, is there a water purification system and what type, how to you maintain the water purification system and how often, are the filters easy to access, remove and clean?
Children: if you have children, is there a smaller cool down seat ideal for children