Disclaimer - This is not a flame.
I ordered a Mini 9 with Ubuntu and tinkered around with it while I waited for my upgrade parts to arrive, on which I was going to install Windows.
I hated it. I get that it's customizeable and virus free and that "real" computer users love it, but I understand why after trying to use it. It's not user friendly at all, and I would have to spend a lot of time reading HOW to do something before actually doing it. I'm just not a command-line type of guy.
I mean it doesn't use Flash. Any idea how much of my internet browsing consists of using Flash? I love YouTube and blogs often link to videos that I was unable to watch. That alone is enough to glady leave Ubuntu and Linux behind.
It was a slick interface, but it seems you need to know a decent chunk about programming to get the most out of it. I prefer to be lazy and use the years of knowledge I've already racked up with Windows. With that said, I commend those patient/smart enough to get some great use out of it.