I put the Melodyne plugin (version 1.3.0, not the new version 2 that Melodyne says fixed the problem) on 3 vocal tracks at once yesterday as a "just for the heck of it" test. Smooth as butter.
Not sure what the Bakers did, but there was a little magic that went into X2.
Glad I'm not the only one seeing this unexpected improvement.
Peace,
Tunes