Shopify Flow

Very powerful and highly useful. Terrible interface and development is unnecessarily complicated as a result. Once you "muddle" through the weirdness of it (even for Shopify) it can be used productively.

I do notice periodic "outages" every couple of months or so, when Flows that normally work without a problem fail to fire for a time, but they "come back" after a short time. I'm not sure that I would trust this for anything "financial" or "mission-critical" in nature but it's OK for marketing and housekeeping functions.