Pros: I bought this from a brick and mortar store because a 5 year protection plan was available. I bought this TV to use both as a computer monitor and TV. As a monitor the one requirement that it absolutely had to have was 4K @60Hz @4:4:4 chroma subsampling. For PC, Older or less expensive UHD or HD TVs may use 4:2:2 or 4:2:0 which compress the signal. Sources other than PC don't use 4:4:4. This TV has HDMI 2.0 which is the only version so far that can do 4:4:4. Without 4:4:4 the picture quality is less that what you would have with a regular computer monitor. Without 4:4:4, I noticed that small black text on a red backround (uneven number of pixels) and excel charts looked bad (bars had compression artifacts or ghost image surrounding them. Lines were inconsistent color). To get it to work you need these things: A Nvidia GeForce GTX 900 series or AMD equivalent; use only HDMI port 1 on TV; set HDMI UHD color to ON; and set device type to PC (Press source, select port 1, then press tools, and select device type.) Once this is done the picture looks absolutely perfect. Also, DVI to HDMI cables will work @4K @60Hz @4:4:4, and will work in any of the 3 other ports at lower resolutions and/or frequencies. The salesperson will try to sell you expensive cables. He said $40 per cable was the minimum that I should spend. You definitely do not need to buy expensive HDMI cable(s) as long as they are 6 feet or less and you won't be plugging/unplugging all the time. The only requirement is that the cable be a "high speed" HDMI cable. The free cable that came with my DVR works very well @4K @60Hz @4:4:4. However another $2.50 cable caused the PC audio and video to cut out for a second or two on rare occasion, so I used that one for my DVR, where it works good.

The colors are more vibrant than anything I've seen before. The framerate is interpolated to 60 Hz, which I do notice sometimes. The motion looks smoother in what is sometimes called the "soap opera effect". The TV came with the ECO sensor turned on. It will dim the picture more in a darker room to save energy. You can also set a minumum backlight brightness when it is turned on. I measured that the TV uses 114 to 133 Watts without eco sensor and about 39 to 44 watts with it on (but the picture is too dark IMO). It was about 73 to 74 watts with the minimum set to 5.

When playing video games on the pc, the input lag is low enough that it is not an issue at all. Some Older video games sometimes (or always) crash when the resolution is set to 3840 x 2160. I won't be using console "game mode" on this tv because I only play games on the PC.

Cons: At first I couldn't get the 4:4:4 to work because I didn't set the device type to PC. I chatted with a Samsung rep online and he didn't know enough about it to tell me that, and he wasn't even sure that it could do 4:4:4. When I bought it, the salesman didn't seem to know either and so I almost returned it because I wasn't sure it could do 4:4:4. The 3rd day, I figured it out on my own and all was good.

I tried hooking up my 20-year-old Yamaha YST-M10 computer speakers (also 10W per channel) and they sounded so much better than the tv speakers that I will keep using them even though I can't control the volume with the remote control. There is a stereo mini plug and an optical out on the back of the tv for this. I also noticed that when using my computer the sound now comes through the HDMI cable and it is not initialized until the windows startup sound has almost finished playing, so you never hear the beginning of the startup sound.

When I first connected the tv to the internet, I couldn't get it to accept the wi-fi password, so I connected the LAN cable and it worked. I later got the wi-fi to work by pressing the WPS button on my router (I need to use the one ethernet cable for the computer). Over the first 3 days, the tv used 2 to 3 GB of data and I only used the tv web browser for a few minutes. So most of that data was for something unknown. I have a 10 GB limit per month with my satellite internet service so I need to be able to easily turn wireless on and off. I chatted with a rep and he said there is no way to easily toggle connectivity on and off. You can disconnect easily, but to turn it back on, you have to hit the WPS button on the router again. My router has a simple button that toggles the wireless on and off, so it is easier for me to do it that way. But I have to make sure the TV is turned off whenever I use wireless for something else. There will be times where both will need to be on so then I will need to disconnect the tv.

Other Thoughts: To verify 4:4:4, look for this section after clicking link:
Testing and Technical
T1) How do I know if my TV is 4:4:4 capable? -OR- How do I test for 4:4:4 capability?
http://www.avsforum.com/forum/166-lcd-flat-panel-displays/1381724-official-4-4-4-chroma-subsampling-thread.html

At the moment, I have a $30 DVD player hooked up through the composite input and the upscaling to 4K doesn't seem to be that great. Soon I will buy a blu-ray player for this TV and I expect that the upscaling through the HDMI port will be better (1080p from my DVR looks great). I have a bd-rom in my computer, but I cannot find free or cheap software that plays blu-ray movies that includes the full menu functions that allow you to select, for example, commentary or bonus features. 4K UHD blu-ray players will come out before the end of the year but I don't think I will buy one right away. It takes 5 to 7 seconds to switch between input sources. I also tried hooking up my old VCR to the RF connector just to see if it would work, and to my surprise it did, although there was some noise/sparkles in the video that was not bad enough IMO to make it unwatchable.

On day 6, I received the 4114 Fixed Wall mount bracket costing $18.54 + shipping from another online store. These can cost $50 or $100 elsewhere. The place where it is mounted has windows on an inside wall, so I installed 2 horizontal 2x4s to the studs surrounding the window, which gave more (needed) room to work behind the TV. When mounting the brackets to the back of the TV, I used two 5mm spacers for each M8 x 30mm screw. I didn't use the square washers because there would have been only 3/4 turn worth of contact with the threads. Even with brackets mounted in the highest position on the back of the tv, the wall plate still covers up the yellow component/composite RCA connector. So I ordered a 90 degree angled RCA adaptor. Without using the two 5mm spacers, there would not be enough room for even the angled adaptor. The 4 HDMI connectors, 3 USB ports, and RF connector are oriented at a 90 degree angle, so space is not an issue. But all other connections are straight back and without the horizontal 2x4s I installed, all of those cables would have to have angled connectors.

This website has a good review that gives info that the manufacturer does not provide:

http://www.rtings.com/reviews/tv/lcd-led/samsung/ju6500

This TV has been on the market for about one month. Overall, I'm very happy with this TV but I'm taking off one egg for the speakers.