The 4K picture on mine is very blurry at times, and when the cameras pan left to right (or vice versa) I see a lot of jutter where the pictures skips frames.  I have a 150Mb/s connection. 
		
		
	
	
		
	
I do not have these issues using the built in apps on my Samsung 4K TV.
Also disappointed that YouTube does not play 4K videos in 4K.
I may send the unit back.
				
			
	I do not have these issues using the built in apps on my Samsung 4K TV.
Also disappointed that YouTube does not play 4K videos in 4K.
I may send the unit back.