I have had the Zagg Invisible Shield (Front & Back) installed on my iPhone 4S with a couple of weeks now and I'm very disappointed. It definitely isn't "Invisible" as from the photo I have included (see below!) you can clearly see the phone is turning brown around the edges. I bought this in CarphoneWarehouse for 31.90 including 'professional installation', which they botched up in the first place!! A high price to pay and you would expect a high quality product. Now I have had screen protectors from as low as 1.49 on before and they never changed colour. I just went for the Zagg to be extra secure with the screen. Has this happened to anyone else using the Zagg shield?