I have the orange box and love it. It replaced an MXR EVH phase 90. The orange box is just so smooth and natural, really blends well with the original guitar tone.
I debated on gett the '74, but didn't want to mess with the mods. One of the knocks on the EVH was the bypass, not the greatest. So for me true bypass, LED, and power jack are necessary. MXR IMO should consider offering a '74 with these features.