I actually had every version of the cases TechArmor makes and in the end I actually liked the FlexProtect the most. 2 of my friends at work are also using this case on their iPhone 6's.
I like the fact that the back is clear and it offered some perfection. If your looking for a case just to have a case and protect the back from scratches and minor drops its a good case.
For me this case was a temporary case I didn't plan on using this for an extended time. With that said on a few occasions I did take off the case to clean it out as dog hair somehow made its way between the case and phone (no idea on that one).
Hope this helps. I should have a review somewhere on here.
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Link:
https://forums.macrumors.com/threads/1794579/