How well does iPad3 run on iPS 7?

Beautifully.

With any major upgrade, there will be a small percent of people who have problems. By and large, they are the people who post in a technical support forum. Most of the people who aren't having a problem are busy using their devices, not posting on forums. That being said, once you update, you can't go back. So, go take a look at iOS 7 on someone else's iPad so you can see what it's really like before you make a decision.

Best of luck.

If you or anyone else using your iPad has problems with vision, please don''t upgrade. I upgraded and my poor husband can't read the screen anymore even though I've changed the fonts to bold and increased contrast.