Pros: A convenient way to charge your iPhone while out and about.

Cons: Cheaper than a new battery but still a little expensive.

Overall Review: I read the reviews before purchasing this and a lot of people complained about this item draining battery life. I don't know if they received DOA devices but I suspect that they weren't using it correctly. It is essentially a portable battery charger. That being said allow it to charge your phone when it needs a charge, and turn it off afterwards. It is not something to extend your battery life, don't always have it turned on, that will greatly reduce your battery life expectancy.