Who cares when most stick them in a case to protect the glass back and get rid of the camera bump.
I'd prefer a flat back, use the extra depth for more battery, make the back out of some non breakable plastic - I never look at the back, glass adds nothing but risk
I'd prefer a flat back, use the extra depth for more battery, make the back out of some non breakable plastic - I never look at the back, glass adds nothing but risk