Used the Slow Changing Rainbow LED in mine and a couple friends GameCubes. Very small easy inexpensive mod that will make you the envy of the neighborhood.

I replaced my 5mm red power LED with this one on my Nintendo 64. It worked great. The color went really well with my new blue translucent shell.

It goes super dim earlier than the original red LED, but it looks so much better! Installed in a gameboy color, can't say much about other models though!

GBC, Pink (specific review to color), FP IPS, Alkaline AA and OG Pelican power supply:
On power supply, the LED is borderline too bright to play at night, i adjust my hand to cover the LED while playing. Totally fine daytime.
On AA, LED is a comfortable brightness with fresh batteries. However im still playing and the LED appears nearly off at night, resulting in unnecessary battery anxiety and frequent need to save. Ive played over an hour with nerve racking low battery LED intensity.
Really looking forward to Li battery mod + voltage regulator and capacitor refresh, and hope that helps since the batt voltage curve is different and should stay bright until nearly dead. The Li constant current AA should also be nice w this LED. Sometimes considering trying to tune with a resistor but I dont think thats the answer for pink since i experience too bright and too dim, not just one or the other.

Maybe I received a defective led? It broke with ease .

The only complaint I have is that it is soooo bright when you play games in the dark. Other than that it looks and works great!