Just getting back around to this open tab.
Yes, I have used Travis and Jenkins a ton, mostly in the area of Android and iOS build and test, and not with micro/embedded code.
My main issue right now is getting a usable simulator working on my main work machine which is a Mac.
I have Windows PCs at home that I can work on, but most of my development is on Mac, so getting that to work would be preferred.
Obviously getting a Travis OS image booted and used is irrelevant to my getting an environment running on my Mac, but psychologically/motivationally I would like to get the latter working first before I start volunteering to get Travis CI tests up and running.