(Michael from Inbox here.)
Ouch. We're just a few hackers trying to fix broken developer tools.
Any claim is just a claim, for sure. We know that it's a long road to earn trust of other developers. One of the (many) reasons we made the sync engine open source was so that developers could run it on their own metal without trusting us. Transparency is really important to us.
This is just the beta announcement of our API. I'd love to hear any comments you have on what guaranteed level of support+performance you would need for a hosted product. We're working on a hosted version now (so you don't have to run it yourself), and developer happiness is the #1 priority.