It's too early to tell
The G Flex has something completely new to offer consumers, but with its low pixel density and extremely large size, it might have a problem reaching the mainstream. LG also doesn't have the marketing push in the US that Samsung does, which is why so many will see the Galaxy Note 3 before they notice the bigger curved phone across the way.
The G Flex's performance and comfortable form factor makes up for the fact that it's merely an experimental device from LG, but you'll have to get over its low pixel density and mediocre camera. Curved smartphones themselves aren't a gimmick — there are valuable reasons to consider one. Since this is just the beginning of the trend, we'll likely sit through several iterations until we find something worthwhile.
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