Not sure why the site advertises "Just for OS X" as if it's a feature.
It's like Netbeans was designed by people who had UIs described to them, then semi-randomly decided that was stupid and they could implement them better without doing any research about why those things were the way they were.
It works. It doesn't suck as much as it could. That's about the best I can say about it.
At least it's not Eclipse. So there's that.
Look at Sublime and Atom. Completely customizable and identical across platforms. I'd prefer that level of honesty to the fake-Mac interfaces that try and fail to look native.