I like to fit screen protectors to improve resale value. My new S2 has just been fitted with a cheapie matt screen protector from Trademe ($6 for 5) and they were surprisingly good - I have tried both cheap and expensive in the past. These ones pretty much pulled themselves onto the glass, no bubbles and the matt finish under the finger actually feels nicer to use than the plain screen. Very happy. I do suspect that there is very little in reality between the cheap and expensive screen protectors apart from a lot of marketing bull.