I am curious to try a bumper when I can. But I am seeing many who are not impressed with its ability to protect the phone.
I am currently testing out the Incipio SILICRYLIC Gel/Shell Combo. It fits very nicely even with Zagg screen protector. The hard shell holds well and seems protective. The gel skin has a very nice feel and good texture, unfortunately I am not fond of it's flexibility at the bottom face near the home button. It moves and stretches there way to much, concerned that it will not last very long.
I have also tried the Griffin Reveal, it fits the phone wonderfully and feels great. Unfortunately it does not work well with Zagg shield on the front and back of the phone. The Griffin fits so well that there is no room for the shield on the back. It does work well with just a front shield.