I just received my Bengle at home, and I was a bit surprised at how fast the steaming was. I asked my wife to video me. The foam quality, I was surprised, was actually quite nice.
It's a bit disconcerting to tap the steam button and not hear anything until suddenly the steam starts. That's because we made the pump really quiet.
This is a beta machine, as I'm one of the app programmers. We might add some "stuff is happening" sounds so you don't wonder if your finger press wasn't registered, and we'll also work to shorten the delay between tap to steam coming out.