Tried the iPad 2 demo set at Nubox CWP. While the distortion does not appear when holding it normally, it appeared when i applied minimal pressure on the back. Think I'll stick to the iPad Air 1 which does not exhibit this issue
IMHO its not a big issue.
I've tested the one at Nubox and the blue blotch does appear. I recently bought one on Wed (pre-installed IOS 8.1) and tested it in front of CSO. The blotch didnt appear that easily as the demo unit. I tested it again at home. I had to deliberately shake it up and down for it to appear. If used normally, it doesnt appear at all.
It's probably due to the slim design that this blue blotch are more prone to appear when pressed deliberately (from back cover) or shaken hard.
Its really to each his own.
As for me, I am now enjoying my new Air 2 with no problem with the "Vibration" or the "Screen" issues. Its just like my new iPhone 6+. No problem with the "bendgate" issue.
As everyone can see from the vastly successful sales in many countries, these so-called issues are really non-issue.
If you really want it, go for it. If you have reasons not to, then, don't.