We switched from Campfire to HipChat about 6 months ago and it's been awesome - apart from the Adobe Air client crashes whenever someone posts a GIF. Hopefully this'll fix it :D
The gif issue was an Adobe AIR bug, so it's definitely gone now. It was incredibly frustrating having them break functionality that many of our users love, especially because it wasn't possible for us to work around the issue. Sorry about that!
We hired someone new, so had to upgrade from Campfire's free plan. HipChat would have been the same price, so we decided to give it a try, and never turned back.