I noticed this while jamming last night - the fact the trem route isn't particularly deep had initially kind of bothered me. However, I noticed that if I pull all the way back so the locking screw bottoms out, the high E goes up almost perfectly a half step. The high B, meanwhile, goes up almost perfectly a full step. the G is almost exactly a minor 3rd. After that it's a little more uneven, but they all seemed to tap out close to "in tune" notes.
You can sort of see where I'm going with this - being able to fret the high B and E on the 2nd fret (top of a F# chord) and pull back to a damned-close-to-in-tune G/Eb (call it the top of a Cm) just by blindly yanking on the bar is kind of FUN.
ITT: Drew delays his albums so he can re-record all his parts with almost-in-tune pull ups.