My dad came a while ago from his work, so i was able to test side to side his iPad 2 and my New iPad.
I noticed that the new iPad performed some times better than the iPad 2. When they both were getting good signal quality, new iPad overcame iPad 2. When we went to a room that is far from the router, they both were with just 1-2 bars, most of the time 1 bar, switching from time to time to 2 bars.
In that enviorenment, iPad 2 overcame New iPad sometimes, but new iPad also was faster than the iPad 2 other times. Very unpredictable behaviour from BOTH iPads, sometimes dw5/ul1, dw1/ul0.1... you never know what's coming, even without moving them. Now i don't know what to think. When my dad grabbed his iPad 2 in the way of the "dead grip", it was algo slower than without grabbing it that way. Not so drastic that the New iPad though.
When i'm far away from the router, dead grip is "deathly" for my iPad, as much as the youtube video posted before, but when i'm close it doesn't even notice. I don't know if this is solved with a back protector.
I was thinking on buy it anyway (i love to protect all my products... i'm sure you too =) ), anyway, i don't want to have a product with some design issue. I had enough with iPhone 4. I'll be using it this 14 days and if we don't know anything from Apple, i will return it for another one and hope for the best.
I'm sure most of the people that says that their is OK is because they've one like mine, you don't notice it's not perfectly right if you don't run speedtest from the distance. Mine seemed to work flawlessly to me in the Apple Store this morning, even though i read about this issue from here and i tried death grip and everything i had chance to try.
Sorry if my english is bad, i try my best but i'm from spain.