Since this bumper exactly replicates the perimeter of the iPhone including the diamond cut bevel, it looks very interesting to me. I've been looking for someone to catch on to and come out with the diamond cut.
They claim there is no signal degradation on their Facebook page. If that can be verified I would buy yet another case. I however am skeptical. Surrounding the phones aluminum antenna with uninterrupted aluminum has always proven detrimental. If someone can prove the loss of signal isn't significant I will love this bumper.
The bottom is well recessed and pretty well protected. It has to be open for the earphone plug, mike, sync. plug and speaker. What can they cover to protect better. A thin strip here or there won't help. Most thin cases even leave the whole front beveled edge exposed.