Hi guys, quick question. I'm about to purchase PS Crystal F&B for my soon-to-arrive iPhone 4. Is it worth investing in something like this or this to protect the sides from scratches? I plan to use an Apple Bumper and Switcheasy Colors interchangeably. A few comments I've read stated that if you leave the Apple Bumper on too long, the (steel?) antenna band develops "micro-scratches." Also, from owning a Colors for my 3GS, I've noticed that after extended use, it resulted in "micro-abrasions" on the back of my 3GS (mainly because it was plastic without any kind of backside screenguard). Could the same thing happen to the antenna band on the iPhone 4? Thanks!