I'm honestly impressed that for my applications they have reached feature parity with EAGLE and Altium, both of which are $10k+ per license.
In my opinion their GUI still needs beauty and readability improvements, but they can somewhat compensate by having a great print preview and PDF export. I'm trying to lobby them towards supporting a wider selection of fonts, but that'll realistically take a year to arrive.
But where KiCAD really shines is compatibility. I was feeling rather grumpy after Altium priced me out of being able to open my old design files. But KiCAD could import them almost flawlessly. The only thing I needed to do by hand was to type in clearance constraint rules.
Export to Gerber and fab also worked as expected. Plus their community forum is like 1000x more lively than the beginner forums for Altium and EAGLE.