I bought ours from a family friend, so didn't have much choice when it came to wet testing.
Either we wanted it, or we didn't.
Any how to cut to the chase, ours is a 5 seater + Lounger.
There are 2 seats in ours that are perfect for me at 6' 1", but too deep for my wife at 5' 6".
For these seats, when she wants a deep soak, she uses a bath pillow.
This works perfectly for her.
If you're buying new however, and have a choice, then a wet test is definitely the way to go.