So I'll start off by saying I absolutely love this TV. I had originally purchased a quantum Vizio, but after setting it up and seeing the picture quality I returned it.
I started looking at various LG, and Samsung sets, but after discovering the Bravia 8 II I decided to go with Sony.
Upon setup of the Bravia 8 II, you will notice how heavy it is, this to me shouts good build quality. After getting it set up, I did not connect my surround sound, because some reviews mentioned a particularly weak sound-I would not say the sound quality is bad at all. The technology going on there obviously works because I had to double check my surround sound was not connected. Obviously bass is on the lower end, this is why we surround sound.
Once I did connect my surround sound, I was blown away at the difference in quality between the Vizio I had just returned, and the Sony.
The UI is much better than I expected, and I haven't experienced any lag, or dropped signal issues.
Picture is the best I've seen in a TV so far in life. There are movie scenes where you almost feel like you are in it. Words honestly can't do it justice, you have to see it yourself to fully appreciate the excellence of picture.