I have the two piece type love mei bumper. I never noticed any signal problems, but I never used my phone without it so I can't really compare. The bumper feels bigger than I was expecting, but if you make it thinner, then there will be too much flex so it becomes not practical. I also dropped mine once on concrete garage floor, and got a small scratch. My screen has tempered glass protector so no scratch there. Back plate is oem Qi back cover, and it is a little thicker than the bumper itself camera so camera is protected as well.