In my experience it's far less useful than simple auto complete. It makes things up for even small amounts of code that I have to pause my flow to correct. Also, without actually googling you don't get any context or understanding of what it's writing.
I found it to be more distracting recently. Suggestions that are too long or written in a different style make me lose my own thread of logic that I'm trying to weave .
I've had to switch it off for periods to maintain flow.
