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It has as modern a UI as your GTK theme has, so if you have Breeze-gtk it's not terrible.

I'm not sure what the starting comment meant, but there is more to UI than GTK theme, or any theme in general.

That being said, those who haven't tried Geany should most definitely give it a spin.

I read it as: the UI is as modern most other applications on your desktop (it uses whatever theme they do)