I'm happy to help with questions about the new Sharp LC-70C6400U 70-incher. I purchased my set online from Sam's Club and had it delivered last Monday, April 2, 2012. My wife and I finally got around to hooking it up on Wednesday.
It wasn't too bad a job, but the instruction book is heavy duty and the set lacks what would be the quick set up instructions that usually come with a PC these days.
We were able to get it all put together and hooked up to my set top box but had trouble with two things. The first one was where to find how to select which input source to use. I finally figured out I needed to press the "input" button on the remote control which brought up a selection menu. I then had to scroll to my input and select it. Wasn't at all clear in the instruction book.
The Wi-fi internet connection was confusing as well. I ended up calling the Sharp Aqous Advantage hot line (number was on the box) where Josh got me straightened out and on line in about 5 minutes.
So with that done, we were able to watch the TV. At this point we are very happy with the TV. Nice picture and sound. Last night we streamed an HD movie from Cinema Now and enjoyed the picture quality and motion very much - I get about 18 Mbps download).
On the point of being LED or LCD, I think Sharp has been a little deceptive here. On the box and on a removable label on the screen it says it is LED. But the manual and specs say it is an LCD with edge-lit LED. The machine isn't that thick and my wife and I were able to manage carrying it from the couch where I attached the stand to the TV table upon which it now sits without any major medical malfunctions.
So, all in all, we're happy with it and happy with the 70" size. It really needed to be that big because we have it in our large family room. Anything smaller wouldn't have worked.
I'm happy to answer any more questions you might have of an owner should you care to ask.