Has anyone tried Flutter Flow? what are your views on this visual app builder?

I always have mixed feelings about no-code/low-code development platforms. I feel they can save a lot of time if made properly, but can cause a lot of headaches if they're complex to learn and provides little to no customization.

I recently read a blog on Flutter Flow Visual App Builder https://www.biztechcs.com/blog/flutterflow-visual-app-builder/ and learned about its promisingly good features.

But what is your opinion on Flutter flow?