Pros: The battery arrived in short order - that was nice. It was fairly easy to replace the old battery in my iPhone 4 with this new one.

Cons: So far, I have not seen that much of a difference in how long the battery lasts. It's been on about 8 hours today and I've used it the way I normally do, and the battery level is about one-fifth left (or less). Not that impressed with it.

Overall Review: I will probably have to purchase some type of external case battery to help prolong the life of the iPhone so I don't need to keep charging it.