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People are using them or they wouldn't be making them.
With the 6/6+ it seems that the holster may be the way to go to avoid bending and have easy accessibility
 
Shagg Bag Accessory Case

I use this:
http://www.timbuk2.com/shagg-bag-sm...880-4-6061_size=8&dwvar_880-4-6061_color=2000

Medium. Fits the iPhone 6 with the apple leather case. It's lined with super-soft fake fur material. It will sit horizontal or veritcal on your belt. The outer zipper holds lots of credit cards, plus a short pen (just in case).

I like it because it fits more than a traditional belt case, because it can be velcro'd to a shoulder bag, it fits as many cards as I need (maybe 5) without distorting the case.

When it zips shut, it's a little tight around the corner, but mine loosened up.

I turned 50 last May, so theory's about age can remain intact. ;-)
 
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