Ask HN: Anyone self-host their payment gateway?

The recent chargify debacle demonstrated once again how thorny a subject the whole area of billing and invoicing still is for us entrepreneurs. In both of the chargify threads an alternative solution was mentioned: Why not host your own gateway, on your own server? These products were mentioned in the comments: http://www.opengateway.net http://github.com/maccman/saasy http://railskits.com/saas/ (I'm not affiliated with any of them) At the core they all essentially provide a recurring billing solution that we can install and run on our own server. Opengateway even claims to handle CCs in such a way that no PCI compliance is required. This was the first time that I heard about shrinkwrapped, self-hosted solutions for that specific task. So I'm wondering: Is anyone here using such a product? What are your experiences, can you recommend one? Or is it generally a bad idea?