I tested the protective sheath on my M8 and am with the result almost 100% satisfied.
It's always a matter of taste whether one prefers a Bumber or a protective bag.
This bag is processed very neat definitely the M8 budge and all connections are easily accessible.
But I am doing a little hard with the compulsion of the cover to the rear flap when making calls. This is indeed relatively easy, somehow it feels but as an unnecessary tight rein on. But as I said matter of taste ...
What is not working well, the state function. For putting down quite nice but the HTC slip out of position when you typed something on. Here missing a firmer locking.
For the price, but definitely a great protection for the precious smartphone vHTC One M8.