After running it for half an hour: it's incredibly good at the visual aspects of UI design.
"incredibly" is doing a ton of work here. I do not think its doing even moderate work on visual design, but it can spew out a lot of ui that looks arranged ... ok.
This is still not in the range of shippable UI for top end companies. Maybe for internal tools and enterprise.
At our comapny we limit to protoypes at most and even find it limited there.
By what measure?
I wonder how much of design capability improvements is related to our collective ability to recognize AI design tropes.