I'm admittedly very new, extremely amateur at photography but I do own an NX1 with that lens. It's the only lens I've used with it (only one I own!). I like it. I can't say with confidence much more than that since I have no credibility, but there are boatloads of reviews that say the optical quality is good, the AF is quiet, and the OIS is good. To me these all seem true. I've had no problems. Even the exposure change that people are talking about hasn't been an issue with the camera--but I've had smart range off the whole time. I'm not doing tons of focus pulling or anything yet, so for the manual focus by wire I can't comment.
