I agree with the idea that some games work better with LEDs and some don't. They can also be used to enhance certain areas, without being a full LED set. We have a Space Station, which has two GI's, a regular white during normal play and a green one during multiball. We put LEDs in the green GI. This strobbing affect works with the multiball and makes the game more challenging but I would not put LEDs in the normal play GI.

We also have a HH that had some LEDs put in it under some inserts and up in the upper playfield (a hard to reach area), which work, but would not work if it was fully LEDed.

We also have an AC/DC Premium, which works well with being all LED. I do get headaches playing it but more so when I am waiting my turn to play and watching the flashers on the ceiling and walls.