I've tried a few types of LEDs including warm retro bulbs in EM games and hated them. I love LEDs. I keep a large stockpile of LEDs and tinker with different layouts and styles on all my games and even I don't like the look of LEDs in EMs.
However can't hurt to buy a bag or sample pack. The upside to buying LEDs you don't end up using is that it gives you more LEDs to toy with for future projects!