Awesome!! I am trying to figure out how to swing the 10 day Panama Canal (if I keep my job). 15 day means full-transit, that's great! I agree with Rick, this is one cruise that a balcony is really best. I've read a lot of reviews that it's a good thing to do part of the passage on board and part down below, but I think that's when you turn around. Don't know if you can do both vantage points on a full-transit. It takes 8-10 hours, so get a good night's sleep the night before so you can take full advantage of it.
I am so happy for you