Mine just crossed 15,000 miles on the original pump, build date in the range, no problems yet. BigDog and Krabil both had to replace their pumps around this miles. My first WRR was an early '08 and had 17k on it and the original pump.
There was a recall on pumps in Japan but not the states, but Yamaha is covering most if not all the failures under warranty. The replacement pumps, used in the 09+ bikes, is a different part number and is apparently either redesigned or simply assembled correctly. I don't think I've heard of any 09+ bikes having a pump failure. I bought the extended warranty because of the mileage I do for just such an occasion...