Love the UI, I haven't run into a single problem/bug/error and I'm fresh out of the box.
My only annoyance is probably something easily fixed. How do I change out what bags/containers I have equipped on my character? I can't seem to find where to do that.
At the top right corner of the lower UI panel, above where your money is displayed, you'll see the text "MazzleUI". Click that text, and your default interface buttons will appear above that, including the original bags.