With regards to the voBack, I emailed them and this was their response:
Their Response:
I think i'm going to give them a shot and see how their product is.
Hello,
I know that other iPhone 4 backs are having trouble in the following places..
1. Metal Screw Holes
2. LED/Camera Diffuser
3. Antenna
Can you please tell me if your backs are affected by these?
Their Response:
Hi XXXX,
Thanks for your questions. We have higher quality back panels compared with the generic ones out of China.
The screw holes in all of these are metal. The diffuser is not included, but can easily be supplied and installed. We haven't heard any reported antenna issues with these panels. Any panel should not affect the antenna.
Regards,
Thomas
I think i'm going to give them a shot and see how their product is.