I was sent a set of the Front/Back Crystal Clear protectors as a replacement for the pack of Ultra Clear (which were very bad, loads of bubbles, and left a residue) and I have to say the Crystal Clear 2 pack of worked excellently. I needed some protection for the back of my Sony Z1 Compact as the plastic scratches seriously easily.
Very impressed with Screen Protector Specialist. Excellent service. Thank you.
I think the other reviewers that left poor feedback were probably talking about the Ultra Clear protectors.