I was lucky through my work to test the G-Flex and here is my comments:
-The Flex body can actualy tolerate heavy weights as seen on Youtube.
-The Flex curved body for me was good mainly for argonomy when holding in one hand.
-Screen size was not a problem eventhough its big, you can easy fit it in your back pocket, the curved body make it smooth.
-Good speed when browsing, nice pictures and amazing battery life.
-Resolution is not as good as G2 but still good.
-Not sure about the price, romurs suggest 1000USD which is a bit overprised.
In general the phblet G-Flex is amazing in many ways but might be overprised, for now i rather buy G-Pro for half the price and wait for G-Flex 2;)
should wait and see is the flexibility good or usles!and of curse strong whith the body