I love this program, it really impresses me. I am a traditional media artist, mostly pencil but some ink stippling. In ink, I don't care, but in pencil the ability to blend is fundamental. After years of people asking you for this simple tool (judging by my forum searches, it dates to 2012 without results), I would have thought by now it would be in the kit.
As soon as Black Ink arrives at that level, I'm in. For now, I will keep practicing with the demo and loving it.