I started building my Gentoo distro back in October 2009. I initially started using a KDE desktop but after too many annoying bugs and missing a lot of my regular apps I removed KDE and installed Gnome. I pretty much have the build running the way I want it, I still have a few apps with minor glitches, but these are still useable. I really have enjoyed the Gentoo experience and would recommend it to anyone who has the time and patience.
I believe that I truly have a customised PC. I built the PC from scratch last summer (2009) it has never had any form of windoze installed on it (woo hoo!!!) and now I have a distro totally customised to my liking. Next step: build an app, but I need to learn a language first :)