Should I get a screen protector for my iPhone 4?

I just got an iPhone 4 and I was wondering if I should get a screen protector for it. I’ve heard that they make the retina display uglier and it collects dust around the edges. Did you put screen protectors on your previous iPhones? Where they fine in your pocket? Is it really worth it?

I never drop my phones so just wondering if the screen is strong enough to resist some scratches.