Once again the comments that spring to mind with the NX100 are - straightforward, unfussy, good handling. It may seem that I don't have much to say but that's a good thing. I like cameras that just get on with the job and the less fiddling about with menus and controls the more I like it.
Much of what I thought about the NX10 holds true with the NX100. The out of camera jpgs are excellent, very punchy in terms of colour and contrast. The look of the files is what I like most about the Samsung NX cameras. The colour is very Leicaesque, which means its both saturated and realistic.
Another plus point is the AMOLD screen which works pretty well in bright sunlight. Like all screens it can suffer from glare but its better than most, as it needs to be since its the primary source of viewing for taking pictures.
The lack of Image stabilisation isn't proving a problem. I seem to be able to hand hold it down to 1/25th sec. with no camera shake. Obviously no SLR mirror banging about helps.
In common with m4/3 cameras its small and light but not throwaway light. It feels like a camera in the hand and not a toy. It manages to combine modern styling with a retro type layout. Its very well designed and I haven't found anything yet that causes me handling problems.
All in all a very able little camera. I've been thinking about getting one for a while but got sidetracked by the Fuji X100. This Samsung won't get anywhere near the attention that the Fuji will get, but unlike the X100, it hasn't got a lot to live up to. I've yet to see anything from the X100, or m4/3 or Sony NEX that betters it for image quality at low ISO's. Its not great for low light work requiring high ISO's, but thats not why I bought it. I pretty much preset it for ISO 100 and f/8 and don't change that. Underestimated and unsung, its a nice addition to what I use. Personally I think its also a very aesthetic camera. It won't win any awards, and the forums won't buzz with discussions about it, but as far as I'm concerned it takes a great picture for not a lot of money, and doesn't pretend to be something it's not. It may not be the "Professionals Choice" but its handling, build and image rendition suit this professional very well.