Pros

1. The iPhone4 has always felt delicate, the bumper makes it feel a lot more solid and impact resistant
2. The case is designed by Apple and you can tell, it’s more polished and fits the industrial design a lot better than other cases
3. The rubberized edges keep the iPhone from slipping and sliding when on a desk or other surfaces
4. I have a car holder from Proclip and they have a new iPhone4 holder that accomodates the bumper.

Cons

1. Attracts lint around the edges of the case which drives me crazy since I’m a bit OCD about my technology
2. Harder to put in and pull out of the pocket because of the rubberized edges
3. Doesn’t fit the iPhone4 dock that I bought