I got mine yesterday. Been using it for almost 24 hours now. Here are my thoughts, based on that much use. People always tell me I should wait to write these things until I know as much as Gruber, Mossberg or Pogue, and maybe I will when I've had mine as long as they have. But first impressions are important. And they will be forgotten quickly, unless I write them down.
1. The screen is not amazing. That's too bad because I was hoping it would blow me away. Kind of like the screen on the iPhone 4. I know the iPad 3 has the same density screen, and it does look sharper than the old iPad. But not so much so that you go "that's a whole new experience." However I do imagine that it would be hard to go back.
2. I just took it out for a spin in Central Park. As you can see the pictures are really nice. This is where the density of pixels is very much visible.
That's FIOS-level performance on a wireless connection. I did that test in Columbus Circle, presumably one of the best hotspots around. But man, that's impressive. Much more so than the screen.