house70 :
I guess it's even more important what happens to a flat phone after 1 flex....
Everyone knocking down this form factor has never used one (Nexus S). Most comfortable phone I've ever used.
I personally didn't find the Nexus S (or Galaxy Nexus) to be any more comfortable than any other comparable phone. But I did find the curvature of the screen to be visually annoying in terms of display appearance. Only slightly, but I didn't think that the curvature added any amount of comfort or functionality; only something different to set it apart from other handsets for the sake of being different.
Personally, I've never broken a phone because it failed to flex under some weird situation. I don't imagine most other people have that problem, with the primary breakage likely due to drops and screen shatters. The G Flex is not easily flexed. Meaning that its curved design occupies a larger volume footprint in whatever vessel one carries their phone in (generally a pocket). I don't know about other people, but I carry my phone in either my front pants pocket, or my back pants pocket. I wouldn't want a bulgy phone in my front pocket (flat phones fit the contour of my pocket and leg quite well), and I don't know about other people, but my ass isn't curved where my back pocket sits, so having a curved phone there doesn't make much sense either.
It's a gimmick, just like the Galaxy Nexus and Nexus S were, to differentiate themselves from all the other devices. It still doesn't augment the phone's functionality in the slightest.