I'm not doing kickflips or anything, but the weight did not hinder my performance at all. It did take a little getting used to, but once you commit to the trick you're doing with a reasonable ollie, all is well.
Plus, there has been some pretty crazy progression on these decks, with probably the most technical flip trick to date on a wakeskate that nobody really knows about (you'll have to wait for alla prima to find out, and no, it's not a tre flip).
Now, i'm not saying it's because of the deck, but the weight hasn't stunted anyone's progression or anything. In the end, it's more of a personal choice, because there are decks that many people will love and others will hate.