I am waiting to buy LEDs for my No Fear until the next run of these for Williams. These really are good enough that I don't want to bother upgrading to LEDs without one. I have a GI OCD sitting here waiting as well.
I haven't had a game without these for a while, and after seeing some of the LEDed games at CAX without these boards, it was pretty bad. There are very few mods that are 100% needed, but this is at the top of the list of mandatory mods.