Since when have you guys been leveraging VPP? How do you find it? I tried to write some code for it, and I found it kinda difficult in comparison to Click / Snabb, but I realize that they're two totally different systems.

we started integrating it in March. Arguable the compile chain is a bit heavy weight, but the code is very structured, easy to extend and a clean architecture. - Dave Barach and the VPP crew were very quick answering questions we have.

BTW Snabb is cool, but VPP is more feature complete.