Just wondering, what's the difference?
Well, for one thing, the 2560x1440 resolution (the Samsung maxes out at 1920x1080 and the ease of setup changing resolution on the ACD is much apperceived by me...also the panel brightness is night and day...I don't do any professional work on the monitor but I do watch a TON of media on it and 1080p/720p video is just stunning on the ACD. The ACD has three USB ports on the back, a charger for the MBP, doesn't require an adapter to connect, has a built-in FaceTime camera, mic and pretty decent speakers, ambient light sensor and matches the display on my MBP with it's black border which I love...
Of course comparing the two is somewhat unfair as the ACD is a $1000USD LED backlit display and the Samsung is a sub $400 LCD...also, if you do not have a Mac computer, the ACD can be difficult to connect...luckily, I don't have the problem...