Sprue-ce Goose:
Any vintage years? .....ie; older better than newer or same consistent quality?
( only half kidding....)
Surprisingly, this is a valid question. The best is actually pre-1986 or thereabouts. This is about when they first changed the formulation.
Up until the change, it was a very nice paint to brush-paint with. It went down silky smooth, could be overcoated when semi-dry without any nasty pull-up and it self-levelled like you would not believe. With a decent brush, you could lay down a coat that rivalled an airbrushed finish - I'm not kidding.