I think they said it best above, "it's the luck of the draw." We did our first and only Halloween cruise this year. Now granted it was a rough hurricane year but I thought the seas were still terribly rough. I have been on 3 May cruises with no issues but I about lost it in October. I had to skip dinner one night because I was so dizzy. There were times when I had to brace myself in the hallways. And watching the curtain sway back in forth in the theater made me really uneasy. We will never cruise October again because I won't chance it. With that being said, I realize we may have bad luck one May but I'd rather take my chances on the familiar going forward.