From a programming standpoint, it's the worst thing in the world: A Windows GUI thing that builds PHP apps and it's closed source.
From a get-stuff-done standpoint: I made a tracking web-app for large expensive tools that knows about Customers, Project Locations, Scheduling, Work Orders and Invoicing - it will grab a customer signature and email them the receipt. I did it in about four hours.
It has hooks in the system for those that actually know what they're doing (not me) to embed PHP code at important points.