I was a bit cynical when GNOME started writing new 'modern' desktop apps. It seemed like a lot of wasted effort chasing Windows/Mac. Who really needs a native desktop maps app? But I actually really like the new apps they've put together. They're simple, clean, and lightweight. I'm a bit surprised that they're made with GTK. Still hate "hot corners," though.
Have used it for long time? It is really buggy. After awhile it literally slows down. I keep my workstation open for at 2 days and after 7,8 hours it gets slower and slower m.
And sometimes it crashes badly. That should not happen with desktop environment.