I have used it for a team of 10 people (at 2 locations) and it actually reduced some overhead in communication. I had set it up on a desktop machine for about 2 months and only adjustment I needed was to increase heap size for JVM. If you are using git, give it a try. It is dead easy to set up.

We've been using it for a small, but growing team. It's been beneficial every step along the way.