I've had iPhone's 3GS, 5 & 6S. Out of those, I preferred the 'grip' of the 5's flat edges. Listening to a few previews of the 2017 lineup, people are expressing similar views. Maybe the larger (wider) size of the 6S contributes to the less comfortable grip moreso than the rounded edges, maybe not. Perhaps a case manufacturer could accomodate me by making a flat-edged case to wrap around the iPhone 8? What would you prefer?