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You aren't going to like this answer, but honestly I can't see how you could wet test 4 different tubs in one day and come away with anything besides wrinkled skin. I couldn't do it. First of all, you really need to give each tub a good try: sit in every seat for a reasonable length of time, play with the controls, see if you are comfortable etc..Depending on the temperature of the water, your tolerance for staying in the water may not be long enough to give each tub a fair test. You would probably get the most out of the first tub tested, and then spend less and less time in each successive tub as you (over) heat up. I guess you could stand around the showroom in your dripping bathing suit for at least a half an hour to cool off between each tub. I doubt most people would be comfortable doing that, and doing so would undoubtedly wear out your welcome with the dealer. Why not try two tubs tomorrow and then if necessary, the other two on another day? In any event, start with the tub that you think you are most interested first. That way you will give at least that one a totally fair (to you and the tub) test.Regards,Bill