LEDs behind Sys 1 can look unreal IMHO. I have installed LEDs in select places on both the play field (inserts) and backglass and I reckon they really make some of the grand old artwork pop. I am not a fan of LEDs for GI on these machines but for inserts and feature sections of the backglass I wouldn't hesitate. You still need some normal globes behind the backglass to give it some general lighting as opposed to spot lights that LEDs give off.