first let me say, fit and function is spot on. can't tell them from the originals.
my only "complaint" (i use that term loosely do to my application) most of the specks, light spots, and marbling that make them "Neptune Buttons" is (at least on my D pad) in areas that wouldn't be seen if installed in an original case. however, im using a clear case on my NES controller so it can still be seen, and they do give a unique look. they say "colors may vary ..." the difference between spiffy and cool is luck of the draw and application.