I have been building on Knack since 2014, and, with zero coding skill, have built some really cool things. My current business runs almost entirely through Knack (less email, accounting, and document storage). The solution I currently use was built up to a point, before I did eventually need to optimise, and that required code. The Knack community, and one Knack developer in particular, helped us achieve that.
I am very happy to share what we have done, and the support we have received.