For me, a noisy bearing can destroy the feel of an otherwise smooth yoyo. But when I can get a silent bearing combined with a smooth yoyo, then it’s amazing.
As I’ve been polishing yoyos, I’ve started to pay attention to the difference in weight between the halves. Usually the weight difference is pretty minor, but occasionally it’s been larger than I would have guessed. I’ve tried to get the weight difference down to a few thousandths of a gram, and so far in every case that I’ve done that, the yoyo ends up being much smoother than it was before I polished it.