It's a win for the customers. From what he's told me, there's zero churn so far despite the hacks (including one where the hacker emailed every customer about the hack).

It's because the software is that much of an improvement over the incumbents at a fraction of the cost. Better features, more flexible, easier to use, faster, etc. Everything about it is better than the two major vendors.

The rebuild will likely end up easier, IMO, because the screens and the logic is all done. Most of it just has to be moved to strict backend and then have the APIs secured correctly.