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Aftermarket reeds allow a bit better airflow over stock. More air = more HP possible. On a stock 500, you won't notice much gain in performance because the stock reeds are not limiting you a whole lot. If you increase airflow to where the reeds are a bottleneck, adding aftermarket helps a bunch. Larger engines with aftermarket pipes and aftermarket intakes show improvement, even more so if the cylinders are ported, because the increased airflow makes the reeds the weak point.
I don't think I would spend the money on a stock 500, there are better improvements you can make for the bucks, such as aftermarket can/pipe combos. If you have already done other mods, it's your call.
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2007 RMK 700 155", 2008 RMK 600 155", 2006 RMK 600 144", 98 Indy 440, 95 Prowler 550 2-up, 1990 Indy 650
RIP, destroyed by fire 1-22-2008 
04 RMK 800, 05 RMK 600, 02 RMK 800, 97 RMK 700
http://www.avalanche.org/accidents.php
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