Before anyone climbs me like a tree, please remember that this is my *opinion*, and since it's my opinion, it is as valid as yours, just as your opinion is right to you, mine is right to me, and that's the way it's gonna be.
I don't like the way they look. They make things too bright, and distort the colors of the machines. Things glow in different intensity than the designers intended. The insert gets so dang bright many times that you can't make out the lettering on them.
They hurt my eyes.
The ghosting and strobing is just another minus in my book
I like the way the games look with 44s and 555s. The balance is perfect. It's not too dim, it's not too bright, it's perfect. It's a masterpiece.
*In my opinion*, Putting LEDs in a pin that was designed to have regular bulbs in it is like putting a moustache on Mona Lisa; it's like putting a fart pipe and underbody neons on a honda civic.. it's just too much. It takes something that looks decent, and makes it look tasteless.
At least they are reversible.
I have tried sprinkling a few here and there, just to see how it looks. I've tried some in pop bumpers, and tend to put them in pops because I've had a few games (think: t2) melt the caps with regular bulbs in them, or had a game where you can't change the bumper lamps easily (cftbl) - but they aren't for me.
And the argument that the manufacturers make LEDs that look like conventional bulbs - why pay more then? In the use pins get in my home, I don't strain connectors, I don't melt inserts, I don't burn through translites or backglasses - the expense is unneccesary!