I was in the NRT RCC for about 3 hours on Monday, and wireless was very fast and stable. Absolutely no problems. I'll admit that it wasn't packed with customers, but certainly not empty either.
Of course I checked out the new NH biz lounge near gate 42, and have to agree that it looks great. However, there are no windows at all since it is downstairs. Also the wireless was incredibly slow, to the point of being unusable because the connection kept timing out.
In terms of food/snacks I will miss the SQ lounge for sure although this new lounge appears to provide some kind of Soba noodle soup freshly made upon request.