In a few words, this is a wonderful monitor. I remember when ultra widescreen monitors first started popping up here on Amazon about 2012 but the prices were far beyond what I could hope to afford. Fast forward to recent times and the prices have started to drop a bit. The prices are still a bit steep but when I saw the LG listed for a bargain from a seller because of being an open box, I bought it.If there is one thing I'll complain about right away, it's that LG is vague about the requirements or trouble shooting for using this monitor. I downloaded the manual and skimmed it, but I didn't see anything outstanding. When I hooked up the monitor to my 2009 Mac Pro with it's original GT 120 graphics card (with an anemic 512 Mb of RAM) it worked... sort of. It only pushed out a maximum of 1080 x 1920, no matter what I tried with both the System Preferences and fiddling in the monitor's menu. (The little toggle switch at the bottom is kind of cool -- I had no problem quickly figuring it out since I knew ahead of time where it was located and how it should work). It was deeply annoying as I knew it should all work.After using it like a standard widescreen (stretching the resolution to "fill" the ultra widescreen distorted everything and was too annoying to put up with) since the day it had arrived, after posting to Apple forums requesting advice and finding out there were others with the same problems and even upgrading the aging graphics card to a much more powerful EVGA Geforce GTX 960 with 4 gb of RAM and still not getting joy, I was almost ready to give up on this monitor. Then, ironically, I tried something stupidly simple: I had one HDMI from the Mac Pro to it, and I plugged in a second and brought that down to the second HDMI port on the LG. Suddenly a heavenly chorus sang and the LG revealed it's promised ultra widescreen glory!I remember reading that part of the functionality of this monitor is that it can be used as a split screen, but nowhere was it mentioned that BOTH HDMI ports on the rear need to be plugged in for the monitor to work correctly (at least in my case). So, anyone with an older Mac thinking about buying this monitor, take my advice. Do it, but know that you will need to hook it up with at least two sources that use the HDMI on it to get the full resolution. If you have an older Macbook, you might be able to get away with just using an active mini DisplayPort to HDMI adapter to take advantage of this monitor with only one cord. I don't know for sure but I did read that anecdotally somewhere in the Apple forums.As for new Macs and MacBooks, a single HDMI should be ample. The same proves for Windows users. There is software for both Mac and Windows at LG's website that can be used to turn this LG monitor into a discrete dual monitor with two computers, each using a port. I've not tried that yet.As for the picture, I'm more than thrilled with it. I'd describe it as being somewhere between standard and retina in terms of resolution. It seems a little better, with crisp lettering and great color reproduction. I am very pleased with this LG monitor but only regret that I didn't figure out how to take full advantage of it till two days ago (hence my long delay in posting a review). My Windows buddy has a 27 inch Samsung he purchased just a year ago at Costco, but I can tell he's intrigued with the possibilities that having this monitor presents. Take it from me, it is WORTH IT.