I bought this along with a crystal clear screen protector from Media Devil for my 4S and I'm very happy with both products. The tinskin is easy to fit and still allows me to fit my bumper. I disagree that it is more slippy than the phone itself. Great company to do business with.
Excellent product, arrived earlier than expected, will use this seller again definitely. The screen protector was easy to apply after following their video. I also used Sellotape to position it first having seen that advice elsewhere. It doesn't affect the sensitivity of the screen at all on my 4S. Great communication from seller. I also bought an aluminium Tinskin from them which is great and both products still allow the bumper to fit, so great all round protection.