Just be aware that the person you sign up with may push hard for you to purchase the whole pack. I did Aqua for the first time on Summit this past summer and was super excited to try some classes - and I well might have purchased more after trying them, but the guy doing the fitness class sign up literally walked away from me and the spa worker who was touring me around when I said I wanted to just do the 3 to start with. The spa worker looked shocked and was about to go after him, but I told her not to bother. I'd just do my own thing in the gym. I didn't want to have to deal with his attitude all the time.
And yes, I did mention his behavior in my follow-up email.