Hubs and I went on the Poly when we first married, 21 years ago. We absolutely loved it, but there ARE a few drawbacks. The main drawback (then, and I'm fairly sure they haven't changed it) was NO hot water for showers!!! And they didn't tell us that until we were already onboard the ship, either.

I showered in the afternoon, when the sun had taken at least a small part of the chill off the water tanks. Hubs screamed a lot.