I love the Wingmaster. It is a great gun. The best way to tune up your express is probably to sell it, and spend the extra $250 on a Wingmaster. If you replace the barrel and wood, for instance, you've already gotten there. I also think, but am not certain, that the Wingmaster has a more refined trigger group than its promotional counterpart.
That said, lots of folks have expressed how to smooth up ol' Bessie, and they are cheap or free. Flitz in the action a few hundred times works pretty well, for instance. Wingmasters are beautiful guns, but not too great in the duck blind if you are looking to keep them beautiful.