Did I really need the apple screen protector to protect my iphone 4?

Is the iPhone screen easily scartched? I saw lots of people has an apple screen protector to protect iphone. So did I really need the apple screen protector to protect my iphone 4? Tell me your experience. Thank you in advance.

http://www.pcworld.com/article/191826/apples_ban_on_screen_protectors_makes_some_sense.html