I bought one approximately a month ago. A few personal observations.
I sit roughly 40-50 cm from the screen and i can still see some (pixels). I'm no tech geek but that generally means that the PPI isnt that hot (but its a budget screen remember that). Anything greater than 60 cm away though is good.
An important point to note is that MOST content is not even HD (720p) so when you upscale content to 1440p...well you dont get that uber sharp effect. Though the native is 1440p, i did try it out at 1080p but the overall effect appears abit more blurry (naturally) but I would reckon too that at 1080p it isnt as good (picture quality) as the high end LEDs (well you do get what you pay for).
Don't expect great black contrast from a LED (even one that has a Samsung PLS). It has difficulty with gamma and separating the deepest darks and the lightest lights. Didn't do any professional colour tests but the screen was noticeably darker than my 5 year old LG TV but has more colour saturation, contrast and detail.
Refresh rates for me are ok. Overclocked it to 87 Hz easily but couldn't achieve a stable OC at 110 or 96. Not much difference to me to be honest though I havent tested it on a fast FPS like CoD.
The base is heavy and tilts at an angle upwards. Personally I can't wait to remove it and vesa mount it.
Other things that I don't care for but might matter is the poor build quality (the Qnix logo is pasted on and dropped out

) and the LoS/gaming modes are just erm rubbish.
Edit: there is a similarly priced Samsung 27" monitor (that cant be vesa mounted) with PLS as well I think but i can't recall the model that you can consider