Quoted from WolfManCat:
I am very impressed with the LED image quality. I usually go the LCD route but think I will keep the LED in GB.
I picked up an LED when EBAY had 20% off and ColorDMD still had some listed at the time. I put it in my ST. The one thing I couldn't get over was the visible off pixels / poor blacks. I experimented with a number of different display covers until I found one I liked. Now black looks black and contrast is much better.
I couldn't find anyone selling a solution, so I made it myself. If anyone needs one, I can make them for $20, pm me. Or if you want to use a clear cover you have, can also provide polarized film for $10. It will also be a big improvement, but it's not as good as the custom plastic one. Here's a couple pics from my ST for comparison to the GB ones posted. That's how my ST used to look too.