I don't have a ton of time on an A-Cat, but spent a handful of weekends on a Boyer mkIV this summer, and it would blow the doors off the Viper going to weather. Unless you've got an almost 400lb team and wind out of the A's comfort zone, I don't think the Viper has a chance upwind. I'm not saying one way or the other about any A against the new Nacra. But it'd be a fun shoot out! Get four boats together with each model with a good, and okay team and see how things go.