I have done this cruise twice . Once in May and once in early Sept.
On both occasions, what I interpreted as gentle rolls on the way down, were interpreted by others as big time rocking and rolling. It is in the eye of the beholder .
Most recent trip back, last May was a bathtub all the way home.
Our experince on the way home was a bit different on our first Bermuda trip.. We passed through a cold front about 2 hours out from Hamilton. By dinner time we had 30 foot seas and the majority of passengers and crew were having some discomfort. By 10pm things had calmed down enough for the major production show of the week to go on. By midnight we came out the other side of the front and the next day was one of the nicest sea days I have experienced.
Weather is just about the one thing you cannot guarantee on a cruise
This year's itinerary for Horizon is quite nice. Do it. Great little ship and maybe the best cruise destination you will ever go to.In addition, sailing in and out of NY harbor is an experience not to be missed.