***Please note that this is the UPGRADED U28-E-590D model, over the identical U28-D-590D model. The main differences is, the HDMI 1 input(the first one, nearest to the DisplayPort input) has been upgraded to HDMI version 2.0(from version 1.4). Also, this new version includes AMD's FREESYNC technology for PC gaming. The older model only includes a GAME mode picture setting, which this newer version also includes.***I was lucky to purchase this during the Prime Day promotion, which discounted this monitor to $300, so at that price, this is my 5-star rating review. Even at $400, I still think it deserves 5 stars. One of the key things you should notice is, this monitor has a TN panel, not an IPS(or PLS) panel. For the most part, the general consensus agrees that TN panels are better for gaming because of decreased input lag, and better color accuracy, while IPS panels offer better black levels and contrast, and viewing angle. To my average, unprofessional, and untrained eyes, I can sense some of those things.I used to have an LG 34 IPS monitor, LG Electronics UM65 34UM65 34-Inch Screen LED-Lit Monitor, which I bought for $600 almost two years ago. Now, there is a newer version, LG 34UM68-P 34-Inch 21:9 UltraWide IPS Monitor with FreeSync, for about $450(you can find a deal sometimes for under $400). At that time, the LG by far had the best image quality I have ever seen in any monitor or television. The images seem to literally pop out of the panel, and the black levels and contrast were superb. Overall, I would say that the LG has a little better image quality. But what I love about this Samsung monitor, is its scorching brightness - if you set the brightness to the maximum 100, you might just go blind - it has a brightness level of 370cd/m2. It also has Freesync, which is awesome for gaming if you have a Freesync AMD graphics card. And then finally, it has 4K resolution. You might not think you can tell the difference when you set a resolution this high for a monitor that only has a screen size of 28 inches, and to be honest when I was using the older version of this monitor on a Windows 8 computer, I was not impressed either, as Windows 8 didn't do a good job of scaling like Windows 10 does, so everything looked tiny and really hard to read. But with Windows 10's scaling options in the display settings, you can easily bump up the size of app icons, text, etc., making great use of the 4K resolution. Once you see how crisp and fine text and high resolution elements look in comparison between 4K and 1080p, you will never want to go back.So if you can find this monitor at a great deal as I did, or even at up to $400, I think it is a great investment for the future. With the DisplayPort 1.2 and HDMI 2.0 ports running at 60Hz, you are future-proofed for when you upgrade your computer for the future. This technology should last you at least 5 years into the future. Now, all we have to do is wait another 2-3 years until those 31/32-inch 4K monitors from Samsung and LG drop down into the $500-600 price range....**UPDATE: July 29, 2016 - As I just finished this review, Amazon has them in stock again for $400.****UPDATE: July 29, 2016 - If you want a good IPS alternative, there is this 27" 4K monitor from LG: LG 27UD68-P 27-Inch 4K UHD IPS Monitor with FreeSync, and the white version: LG Electronics 4K UHD 27UD68-W 27" Screen LED-Lit Monitor****UPDATE: August 13th, 2016 - As I have had more time with this monitor, I must say the viewing angles are not as good as the LG 31" 4K IPS monitor. If you are not in a magic spot of only a foot, the color shifts are glaring, especially the vertical angles, which add a red hue to the screen. To be honest, with the lowering of prices of 4K monitors, I am now more inclined to advise you that this is only a 5-star product up to $400.**