Don't forget the 2-LED (dome style) from CT. They look like Retros but are cheaper and don't blow your eyesockets out if you look at them directly. I prefer these in most areas for GI. If I need brighter in areas where the light won't be seen directly by the eye (under plastics), Retros are good but it's also worth trying Pinball Life 4-LEDs. The spread is great and they don't "spot".

Something else to consider - while a Retro might not hit your eye from the players perspective (under slings, for example) - if you have a bunch of games in a row, they might hit your eye while playing another game. Another reason I like the 2-LED ones. They offer the same "feel" and spread of a Retro due to the old-school bulb dome...but are just less harsh on the eye. I tried retros at first and they did look great...but then I played a game next to that game and my eye was just drawn to the intensity of the game next to me, distracting me from the one I was playing.