I'm building up an On One 456 Evo2 frame, and the max fork it recommends is a 150mm, which I plan on going with. These two forks are the one's I've narrowed it down to.
I'm leaning toward the 55's but installing the spacer looks like a pain. Is the Revelation a better fork anyway? I don't have much experience with Rockshox stuff, but I've had Marz on previous bikes and I've loved them.