Touchbar, and the Mac in general.
On my model:
- Sound issue I mentioned - really irritating. Means I can't use it for conference calls without a headset or for presentations
- Touchbar crashes every now and then
- Keyboard issues with at least two of the touchbar models in my office, they needed to go in and have the keyboards replaced
- Cracking /snapping sound from when it wakes up - I don't know what causes this
Personally, I don't like the OS. Yes, on the terminal its like linux, but Finder is pain and the fact that I don't have home / end keys on the keyboard is a struggle. All apps don't use the same keyboard shortcuts for home and end, so now I need to use different key combinations, or remap keys in the apps if I can.