Things I Love about the x100s
This I think tops the list as my favorite thing about the x100s. Now this is mostly my fault but I used to get so frustrated when I would be using the optical viewfinder on my DSLR and would switch to a new location and forgot to check my settings. The image would be either over exposed or the opposite. Having the electronic viewfinder on the Fuji allows me to see what I'm going to capture in the camera and it's awesome. It's not for everyone, my wife who loves the Fuji loves using the optical viewfinder. Using the back LCD to compose was at first, I thought, very un-pro. I have found it, however, to be very useful if you want to shoot low but maybe the ground is wet so you don't want to kneel down as you would have to with an optical viewfinder. For the same reason, it also makes shooting babies and kids more enjoyable and much easier. I can shoot on their level without having to lie on the ground. It's also nice that when I take a picture with my eye to the EVF it will show me the picture I just took in the viewfinder to review. I'm hoping to move forward into an XT-1 down the road and I already know I'm going to love it using the flip out screen. I hope they eventually bring one of these to the x100 series.
These things are cool to look at and they really just help you feel more in control. I use this camera in Aperture Priority mode a lot and having the aperture wheel up front is a great benefit. They are resistant enough that I don't have a problem with accidentally bumping them. I used to have this problem a lot on my DSLR. A lot of people seem to say things about the wheel on the back of the camera but I actually enjoy it. I don't think it was as weird as everyone thought and I was a little sad to see that they took it away from the x100T. If anything, Fuji could have made it a little more sturdy, but I do miss that wheel.
I use focus peaking when I'm photographing landscapes or things that don't move much. It's really accurate and it allows me to not have to hit multiple buttons when i'm trying to choose my focus point. It's a great feature. The selective focus is great too. I love being able to choose where it's going to auto focus. This really helps when I'm taking portraits of people and I want to be sure that I'll be focused on their eye. It's also helpful that I can check my focus points after the image is taken by pushing in on the back lever. I don't really use the regular auto focus or the split image at all but my wife loves to use them.
This thing is small. It's a great size to really take anywhere. It won't fit in a pocket but you probably don't want it sitting in your pocket anyway. I recently shot a concert with my Canon as I needed some longer focal lengths. I carried the 70-200mm 2.8f from Canon around and after about the first 20 min I was ready to go home. The fuji can be worn around your neck or on a sling, and after a day of walking around you won't be left with a sore neck. It also doesn't scream "photographer". I love using it at weddings because you do look just like another guest as so many have pointed out. The size and quality really shine in this camera.
Most of this stuff has been said over and over again by other photographers who use this camera. I decided when I got it that If I made it a year I would write this and see if anything was different. A whole year and I'm still in love with the x100 line. Is the x100s for you? Maybe not. If you are looking for something with an assortment of focal lengths you may want to stick with your DSLR or you could look into the other lines of Fuji Cameras. You can pick up a used original x100 for about 400-500 dollars right now on Amazon and thats really all people need. The x100T that just recently came out has tons of really excellent features on it now; new film simulation, wifi, and a new +3 and -3 exposure compensation dial(awesome!).
My wife and I have reached a point where we are not taking pictures with our iPhones much anymore. We love the quality and the prints we are getting out of the fuji. It serves as both our family camera and our professional camera of choice.