After 10+ years of installing Linux (Redhat 6, Gentoo, Debian, Ubuntu) on desktops and laptops I craved a supported system so I might finally have everything working 100%. I bought a Dell XPS Developer Edition that ships with Ubuntu 12.04 LTS and I LOVE IT. Unity is fine. Most of all, everything works and is fully supported by Dell!!!
Ubuntu LTS is a good system for vendors to support. They can't support several distros, especially when they change frequently. And I like that I don't have to dist-upgrade every year. By the time 3 years is up I'm ready for new hardware anyway or at least a fresh install. Longer support cycles and fewer technical issues mean I get more work done and enjoy my computer more.
Just some little things I enjoy now. I can close my lid and after several days of sleeping (reliably), the battery charge is unchanged - and it's not hibernate (no POST). How cool is that? Built in 1920x1080 display and external display work without any problems (had strange problems with Ubuntu on Macbook Air before). Battery life between 5 and 7 hours depending on use.
Ubuntu works with hardware vendors better than any other desktop Linux OS. And why you may not care, that in turn provides a nice platform for proprietary software such as Steam.