I have admittedly been slightly unhappy with Marketcircle in the past, when they dropped the ball on Billings development for many months (see early reviews). They did, however, eventually come up with the features promised at 1.0, and every update since has been free for the earliest adopters. Given a choice, I'd rather pay for updates and have them arrive in a timely fashion, but I think Marketcircle has acted in a fair and generous manner with regards to how things developed -- or not as the case was for a long time.

The previous review does highlight a shortcoming -- i.e. documentation -- but it can be overcome. There is a PDF floating around that outlines the ideas of the layout-engine. Once mastered, it is the most powerful tool available for custom "paperwork." I found reading the PDF a great help in understanding how it fundamentally works, and the rest is sorted out with a little trial and error. I now use a selection of templates that can beat the advertised 5-min mark for fast and easy creation of estimates and invoices. But mostly I spend a little longer, just to admire my designs ;-).

I hope Marketcircle will stick with Billings now and get into a profitable routine of regular, paid updates. Billings is no longer an app with just promise and potential; it delivers better than any app of its class.