I've implemented two self-hosted Gitlab instances at work, for one of the instances on our private network, I'm still fighting with IT to allow us to use LDAP. Gitlab EE is still off our 'pockets' as management aren't too keen to pay for it, at least yet, but I hope that we'll get there.
Our self-hosted instance is also a bit slow, not as slow as Gitlab.com, and if it was written in a language that I'm familiar with, perhaps I and some of my team could contribute to 'making it faster'. Pity I don't have enough time left in the day to learn Ruby. I've read up a bit on the work going on around Unicorn and workers, but maybe some of these things could be better written in other more 'performant' languages?
For personal projects I still use Bitbucket + JIRA. I got to the point where I decided to stop looking for freebies and pay. JIRA has been awesome, totally worth the price.