I liked the concept when I first saw it but honestly it's more trouble than it's worth. On my old work laptop, it would sometimes bug out and stop registering touch. That's a problem when you are in the middle of a call and you need to adjust volume because one of the speakers is too loud or too quiet.

I also don't like how it's harder to operate than physical buttons. Too many times I hit the wrong spot on the bar and for example ended up putting my laptop to sleep instead of adjusting brightness. I've also tried to configure Ableton Live to do something useful with it (maybe mute/unmute tracks or control their volumes); but with little success.

Long story short: I'm happy to see it's gone.