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I do love the 6 Plus caseless but it's just to hard to hold and I feel like I'm gonna drop it a lot of times. I got the Apple leather case and now it's much easier to handle.
 
I use the Apple Leather case because it is a thin footprint that is minimalistic in design. It also adds a grip to the slippery feel of the phone so it makes it easier to handle.

I never use cases that add bulk or anything. Before the Plus I used transparent bumpers to help with grip because, while I'm not a phone dropper, the grips certainly made it harder for me to make any mistakes with it in my hand.

I also resell the phones every year (or two), so adding a little protection increases its market resale value to a mint condition phone.
 
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