[hammaz]

Thanks for asking. I keep it running in the background regularly and get 12 hrs easily and 15hrs normal with my iPhone 5 ...

Compared to something like navigation which drains it in ~4 hrs.

So the extra battery drain will not be a deal breaker for many ... but it still might be for some.... Totally depends on the user's situation in my opinion.

[hammaz]

I should have said ... the variability is b/c of what else I happen to be doing with my phone that day...