At my last job I left last week, we were looking for an alternative to the old GitHub/Jenkins setup, tried Stash/Bamboo for a while, but eventually settled on GitLab and GitLab CI (7.1x, with the Ruby-based CI runners) because the integrations with other services were already so mature. It took minimal customization to our Hubot to recreate our devops scripts and was really more of a drop-in replacement for what our Ruby shop needed. Although we eventually bought an Enterprise Edition license, we were still running the Community Edition (mostly because I left and just ran out of time to migrate), but were hardly lacking anything in the choice to stay on community until other more pressing migrations are dealt with (thanks first-gen Rackspace cloud).

If you're looking to centralize your devops infrastructure, I'd highly recommend GitLab over anything else unless you have a specific use case that GitLab isn't trying to solve (CF's BOSH, or a tighter integration with Atlasssian in a JVM shop for example).