I've never played around with Quarts in Maya before but now have to work in MAX and Maya 6.0.
I was messing around with changing a simple primitive objects rotation to Quarternion the other day and in Maya it was a disaster. If I set a keyframe in a progressive fashion e.g frame 1 rot, frame 10 rot, frame 30 rot etc. the Graph editor displayed the keys as one would expect but as soon as I edit one of these existing keys I get the wierdest "noise" like interpretation between keys and outside. The entire function curve is trashed and outside of undoing.
How would one utilize Quaternions for things like Rigging to obviously avoid flipping and GLock etc.