Right, those PR-2's were real heavy. I weighed them in at 2200 grams. Their freehub was pretty bad too imo. All in all, i saved 550g whilst adding wheel width for comfort and depth for better aero performance.
Other than the wheel-set, the only weight reducing upgrades would be stem/handlebar and groupset. But a DA 9100 groupset would only save me about 300g. So price/benifit ratio is in the ridiculous category.