[timr]

"As far as differentiators, we're pretty fast. We can automatically parallelize your test suite across N VMs. We automatically inspect your source tree, and figure out how to run the tests, without configuration. It's not perfect, but a substantial percentage of customers get a working build on their first try."

Yes, yes and YES.

I love that there's a comment in this thread that claims that CI systems have to be like Jenkins to be marketable. CircleCI was great precisely because it worked basically out of the box, and then the configuration to get it to do more complicated stuff (like, say, running migrations) was as easy as specifying a unix command.

I set up our CI system on CircleCI in an afternoon, and we haven't had to touch it since. That's pretty remarkable.