My wife is very interested in the Amore Bay. When she went to test the tub today the salesperson couldn't answer the question, " what is the sport seat " ? He thought it was just a high seat so kids could watch tv. I finally located the hydrosports kit that is available for use with D1 tubs with a sports seat as I was looking for another dealer who might be more knowledgeable about the products he his selling. Has anyone any experience with the rower and butterfly attachments? I'm especially interested as to ease to install, if the attachments are permanent and if so are they in the way when the tub is used by multiple people. thanks in advance for any insight.