I've previously setup Elastix (Asterisk/FreePBX distro) on a VPS for another business - price was right on the DIDs and minutes, but making it work nicely on VPS, learning Asterisk+FreePBX quirks, and keeping everything up to date quickly became a time-waster.

Twilio/OpenVBX looks like it might be a comparative breeze to setup and use - and let us focus on our core competencies rather than burn time becoming Asterisk/VOIP gurus - but the fact that they aren't built on open standards like SIP makes me a bit nervous. Anyone have any experience with OpenVBX, thoughts, alternatives I'm missing?

Edit: Twilio has somewhat confusing statements inre: Canadian toll-free numbers at http://www.twilio.com/faq/international. Anyone know if they provide US toll-free numbers that accept calls originating from both the US and Canada?