Thanks that's good to know.

Haha I knew "legacy" would ruffle some feathers, by which I mean Stan was pretty much the first application-ready PPS on the block -- robust toolbox of methods, actively developed/supported.

The last slide of this presentation on SMC inference in PPLs is a nice view of the PPS landscape (not to mention the whole deck is a great intro by Lawrence Murray): http://www.it.uu.se/research/systems_and_control/education/2...