Yes, I'm using Steam for Linux and it works great
It's such a shame that Valve supports it only for Ubuntu... Hopefully that will change in the future. I'm positively surprised that some really good games work under Linux. I can remember years ago when I was hearing rumors about Steam for Linux, and trying to make Doom 3 work on Linux (which I did, it was pretty easy). But at that time there weren't any big new games available for Linux.
To be honest, with Sabayon I feel like at home. Considering it's so bleeding edge, it's surprisingly stable for me. Apart from not being able to use KMail (some database error from Akonadi), my system is perfectly stable, everything up-to-date (daily repository) and kernel 3.13.
Edit: I just wanted to mention, you can connect with a higher version of TeamViewer to an older one, but not with an older one to a newer one. That's why it's VERY important for me to get TeamViewer 9. At least I got it working for now.
Edit 2: I just started KMail and for the first time, it works
So the last bug has been solved!