Perfect monitor, perfect service from Amazon

5 stars for the monitor:
- Extraordinarily beautiful and rich colors for a TN panel, good black level
- Great 4K resolution - if you have seen it once, you want to do not want to miss!
- Legal point of view-independent, can dhman change its position in front of the monitor and the picture does not change in the representation
- Great adjustable - height, tilt, rotation
- No input lag, no streaks, fully suited for my personal gaming claims
- Compared to IPS and VA panels cheap no halos at the corners
- The font size: Windows 8.1 has recognized the monitor and possibly scaled. All fonts are legible. No problems, 28 inches is actually in terms of size, the ideal size

My configuration: Xeon E3-1230 v3, 16GB, Radeon R9 270X 4GB, Windows 8.1
- So my personal games (ok, maybe not the latest and without highend graphics) playable in 4K surprisingly without problems, including XPlane 10 and Metro Last Light (!).
- In short, perfect. 5 well deserved stars for product.

These 5 star for Amazon:
my first specimen showed at the bottom continuously from left to right a dark blue stripes, a few mm high, regardless of the brightness, contrast and viewing angle. This is not noticed in the "normal" operation, since the strip is hidden from the Windows taskbar. In games with a dark background such as Metro Last Light or Black Mesa strip disturbed because he has distracted the eye.
Amazon sent me a replacement unit, in which everything fits now. But thank you very much, even for the nice settlement.

PS: Here's a few more settings to calibrate:
Brightness 52%
Contrast 69
User Mode
R = 100
G = 96
B = 99
Trace Free = 60
Vivid pixel = 0