Ask HN: Anyone use Sputnik to run a WISP?

I have a friend who lives in a small town deep in Baja Mexico. He is getting a high end vsat and some ubiquity powerstation gear to create a wireless network over the town and I'm trying to help him find billing software.

The little bit of research I did had me looking at chillispot, wifidog, etc. but Sputnik seems like the solution with the most minimal tech support requirements (perfect for my friend).

Anyone use this service or are there better products to check out?