All of these worked flawlessly when I had physical keys, but now it's hard to know what I'm pressing without looking, and sometimes the controls become unresponsive to touches or drags.
I'm a programmer/business owner, so perhaps it's useful for other sorts of creative professionals, but it feels like a total gimmick to me.
I applaud Apple's innovative spirit, but the touchbar wasn't useful at launch, it isn't useful now, and they don't seem to have put any effort into making it better. I hope they kill it with the next Macbook pro release and just go the touchscreen route like everyone else.