Google for reviews on these and you'll see that satisfaction with Gator Blades is all over the place. They don't seem to work well with every deck, at every height, and on every lawn, so apparently there's some luck involved.
They're made to be used when discharging, not with a mulch plug or while bagging, and if they're on a deck that has the right aerodynamic flow (whatever that may be) they work great.
My clippings are much smaller with Gators than they were with stock blades. I no longer see clippings sitting on the lawn at all, unless the grass is ridiculously tall in areas, and they chop my oak leaves well without having to make multiple passes.
This video shows the design theory, and some shots of what the discharge looks like if your mower plays well with them.
Gator Mulcher Blades from Baileysonline.com - YouTube