I have to agree with the "go for it" people. We, unfortunately, did not "qualify" for Cinderella's Coach because we got married at Seabreeze Point, but we did have the Landau Coach and we loved every minute of it--even when it rained for the loop around the boardwalk after the ceremony!!
My dad said it was some of the best money he ever spent, because he adored having those 10 minutes to ourselves to talk and be together. And he loves the pics we have of us with the carriage.
But, at the same time, I still would have had an absolutely breath-taking day, even if I hadn't had a carriage of any sort. It was just so special because it was our wedding day--and it was in DISNEY!!--the carriage was just the icing on the cake.