Weird interface is right. And the new version is even weirder, what with their attempt to make it look more Mac OS Xish. But damn if it doesn't print correctly just about every single time without any adjustments. I really like that and can completly over look the goofy UI.
I've also used disclabel, and the idea behind that app is nice, but the implementation sucks. Trying to figure out how to actually get a label template to design takes a degree in rocket science.
Discus wins for me on ease of use alone.