Here is a sample of the vignetting for your reference. Would you ask for a refund or keep it? The company said that it is normal and does not want to send a replacement. They can give me a refund but I have to pay for all international shipping costs.
http://postimg.org/image/8oo3gbnll/
This is not edge to edge clear as they advertised!
On my Mac, I have Photoshop CS6. I have not installed photo editing apps on my iPhone yet.