OUCH! Ask him what a hard, dry BF'ing from Works felt like.
LOL, in all seriousness, the stock rear shocks is a FANTASTIC shock. Any company who claims they can make the shock perform better by replacing the piston is selling you beach front property in Arizona. I've done Race-Tech, Works, and stock pistons side-by-side on my dyno, and have seen LESS than 1% change over 400 strokes. All pistons valved the exact same, same oil, same seal heads, same run time. I stopped selling Race Tech and Works heart transplants the DAY I ran that test. It's a complete scam, without a doubt. The ONLY thing I like about the works heart transplant is that it changes the rebound adjustment to a screw style. Other than that, not worth the outrageous $400 price tag for a revalve.
With that being said, a properly revalved stock rear shock CAN out perform a high end aftermarket shock at less than half the price.
Tyler was right stating that most people would be ok with putting a heavier spring on a stock shock, but revalving the shock is the right way to do it.