I've now had an X100 for about a month. Replaces a Canon G7, also have a Nikon D80.
I feel its a great camera. Gorgeous shots both jpeg and raw. The jpegs have plenty of headroom and take edits far better than anything I've see before.
If you shoot raw+jpeg it is slow. If you shoot film simulation (3 different film types) it is slow. However, you can still shoot while its processing. It is important to use a fast card. I use a 95 mb/s card. As a test, I clicked off 12 jpeg+raw shots as fast as I could press the shutter. The cache is limited to 8 shots but it cleared quick enough for me to complete my 12 shots. I normally shoot jpeg+raw as I live in a tropical area and like the ability of raw to salvage a blown highlight if needed. I seldom need the raw. Today a pro friend and I will be shooting with it and its in jpeg only.
Auto focus is not dslr quick. Its quicker than a G7, never hunts for focus, good in low light, I've only missed focus on one macro shot.
High iso is phenomenal. 6400 is usable, 3200 is excellent. IQ is simply amazing. Of the 3 film types, Velvia is too saturated for me, Normal and Astia are lovely. I use Astia, you give up a bit of shadow detail but the color balance and skin tones are gorgeous.
You will need to spend some time on the user guide and learn the camera. There's plenty of additional info on the web.
I normally shoot with a 40 mm equivalent on the Nikon, so a fixed 35 mm is fine for me. f2 is weak, f2.8 is very good, f4 and up is excellent. Superb lens.
Its a joy to carry around. I use a neck strap and I hardly know its there.
I bought mine new and immediately upgraded firmware to 1.21. You can safely ignore much of the complaints on the web as either 1.21 solves a lot of issues or users did not know how to use the camera.
Nits: the exposure dial is easy to accidently move. I have an o-ring around it which works well. There are many changes in the way the camera works when you switch shooting modes. I always shoot aperture preferred so its a non-issue for me. Otherwise, more to learn. The grip is not the greatest. I added a small round rubber pad where my thumb rests and that helps a lot. Am looking for a small rubber strip for the front side of the camera.
I think the bulk of those that sold their camera's may have done so because its not a point and shoot. You need to learn the camera and set it up for your shooting style. Early firmware was apparently an issue, I don't know. The aperture blade issue is covered by Fuji even after the warranty expires. No issues here.