I remember being super excited when I got a free demo disc in the mail from Sony for my PS2.  It had a preview for Viewtiful Joe 2, a game I was looking forward to. I played the demo, had a nice time and went back to play Shadow Hearts. It was here that I realized that all of my saves were gone, infact my entire memory card was gone. Hundreds of hours of gameplay just simply erased. Many games that I would never go back to, like Final Fantasy X, because I was not going to sit through that shit for another 50 hours just to beat the game since my file got erased at the final battle. So when I see people complaining that they couldn't play for 24 hours I pretty much think that is nothing to bitch about, because at the end of the day you got to keep your game saves.
 
Just be glad Sony didn't send you a disc that erased all the data you ever had.