I just sold a $400 camera to someone on a photo forum and he sent me an e-check through paypal. I must say, I've never received an e-check. Naturally, I am a little cautious. Are they as secure as normal paypal transfers? Can he take the money back once it is sent? I have heard that you don't need your account attached to an actual credit/debit card to send an e-check which makes me feel less secure. Am I paranoid?