Top critical review
Does what you'd expect. Significantly extends battery life (x2 at least)
on 24 February 2016
XXXXXXXXXXXXXX UPDATE XXXXXXXXXXXXXXX
Although it has always been rather slow to charge up the battery in this power-pack I've previously put this down to the cables I was using. However the damn thing has completely stopped working after 7 months of use. So I've reduced my rating to ONE star, something that doesn't even last a year is basically little more than a swindle.
Be Warned :)
================ My Original Opinion ===============
Does what you'd expect. (I gave it a Four Star rating)
These are a great combination of hard-case and battery pack.
Obviously they make the phone much bigger and heavier.
The only reason that I haven't given it 5 stars is that I've seen other makes with better build quality in the past - for similar prices.