I've had a mophie for about a year now and I also don't care about the bulk. I love the extra juice more and I also like that it's easier to tell whether the phone is actually in my pocket or not. The best part is just not even thinking about battery life in the least. It gets you more than double the battery life.
The other thing I love is that even after having it for so long, it still lives up to it's full charge potential. Perhaps that will diminish over time but so far I've used it almost everyday for about a year and it's still going strong.
The other thing I love is that even after having it for so long, it still lives up to it's full charge potential. Perhaps that will diminish over time but so far I've used it almost everyday for about a year and it's still going strong.