I can only conclude that it works because a lot of the reviewers that I watched mentioned that they used the device as their daily driver for a week or 10 days or some other length of time at least a week in length.
If they noticed any signal issues it may have been mentioned and none mentioned any issues with it or battery life for that matter so clearly the antenna design "works".
As mentioned above regarding wrapping hands at both ends I can actually see where that is a legitimate use for people that play games and require both hands to move their character around and so forth.
In that case... they are holding onto both antennas or partially covering them so I can see an issue there.
Any of our EU (or US) buddies with this device mind whacking network signal info or signalcheck on there and grabbing it in various places to see if there are trouble spots?
Might satisfy some curiosity I and others surely have about it.
It's supposed to be available the 19th but I am hoping that AT&T ships them out before then so I can play around with it