Well,it finally arrived:
PowerGlider External Battery Case for HTC One (M7)
Overall,I am very pleased w/this case.Battery life is essentially doubled.
Build quality is nice,w/a matte finish.
Access to all ports/mics are present & do not interfere w/functionality.
I-BLASON absolutely nailed the volume rocker!
Once again as w/most cases,this one enhances the phones volume rocker function,without being too easy to accidentally depress.
The phone fits extremely snug in the case,as does the top cap.
BTW,the case is of two-piece design,w/the top cap removable,not tracked/grooved into the body of the case,as I had previously believed/mentioned in a prior post.
The kickstand is a nice touch & snaps securely into place when not in use.
I had a couple of minor gripes concerning the cosmetics/aesthetics of the case & posted them at AMAZON:
Amazon.com: Customer Reviews: i-Blason PowerGlider For 2013 HTC One (M7) Smart Phone Rechargeable External Battery Glider Full Protection Case - AT&T, Sprint, Verizon, T-mobile (Black)
Otherwise,I rate this as a good value & recommend it to the power users who may need an extra bit of juice @ the end of the day, especially when other power sources are not an option,or,inconvenient/impractical.