The X100s is the best camera I have ever owned, the more I use it, the more I fall in love. It's a camera that makes me want to take pictures.
Its classical user interface appeals to me, as does the optical viewfinder. Yes, the Ricoh GR, Nikon Coolpix A and Sony RX1 are nice cameras, but you don't use them like a classical camera. The X100s can be used like my father's rangefinder from 1963 -- if I want to. Or I can have the live histogram and a level directly in the (optical as well as electronic) viewfinder.
There are so many little niceties, just to give you one of them: I use the optical viewfinder of my X100s, but when I snap a picture the camera switches to the electronic viewfinder and shows me the photo I've just taken for 1/2 second (you can configure the duration or whether you want this feature at all). On my dslr, I need to take my eyes off the viewfinder, press play, check the exposure and do it again. With the X100s, I can take a picture, check the exposure, dial in an exposure compensation and take another photo.
Whatever good things you've read about the image quality in the reviews, they're right, this camera produces exceptional images.
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(I'm the guy on the right wearing the Daringfireball T-shirt.)
Whether 35 mm equivalent focal length is right for you depends on, well, you. I already own a Sigma DP1 with a 28 mm equivalent lens, and I prefer 35 mm by a wide margin.
If you're concerned about the AF being slow, don't be. Yes, my dslr focusses faster with certain lenses (certainly not all of them), but focussing doesn't feel like you hold a compact camera in your hands. In terms of being able to find focus, the X100s' capabilities are comparable to my D7000: at a certain point, there just isn't enough contrast for a focus lock. But then it is pitch black dark.
Does the camera feel slow? Nope. Not as fast as my dslr, but I don't have to wait for it.
Do you have any other questions?
If I was God of my own camera universe, what would I want in my X100ss? I'd like to use TTL with my SB-700 and SB-600, and I'd like to iron out one or two things in the firmware (really, really minor things). Plus, I'd like to replace the main menu selector (the one with the wheel) by something that feels as good as the knobs on the top of the camera. And I'd like the battery to last longer (my D7000 lasts >1000 shots on a single charge, the record being ~1700 on a single battery, so I'm used to a lot more).
Disclaimer: I also own a D7000 with 5 lenses, two flashes and various goodies.