I have an X100. I bought it as something to carry around when I'm doing the tourist thing. I imagined it to be a camera that was heads and shoulders above a point and shoot but still really light and portable. It's all of that and it takes absolutely gorgeous pictures. I've made some landscapes with that camera that rival anything I've done with my Mark iii. Now, having said that, I'll echo what others have said about its design flaws. It is just horribly complicated and it's easy to screw up. Every time I pick that camera up I have to relearn it. To make matters worse, the manual is the worst I've ever read. It's just incomprehensible gibberish, apparently written by some Japanese high school students who were assigned the task of writing it as part of their senior English class. If you're serious about getting this camera be sure to look for an after market guide because the manual will drive you insane.
On balance, I'd say I love the pictures this camera takes but it definitely isn't for the faint of heart.