If you can't turn off that top toolbar, it's a no-go for me from the start. Using up ~10% of extremely valuable real estate for buttons that you should have memorized the keyboard shortcuts for? No thanks.

In general it appears to be very wasteful of screen real estate, and to be poorly thought out from a UE perspective. Buttons and fonts are bigger than they need to. There's some extremely quizzical usage of padding, as well.