I went to EB to trade in some 360 games. I was going to trade in Oblivion Collectors edition, Dead Rising, PGR3, Prey, Hitman, LOTR BFME and NHL 2K7. Thats seven games. Before the bonus I was going to get about $75. Even if I got 40% bonus that is just a little over a $100 right for seven 360 games. That was much lower than I expected to receive so I said no thank you I'll keep them and hit the road. The funny thing is that if you look on the shelf for example you'll see Hitman selling for $55 used.
I did this recently the last time they had the trade in deal and got great value for what I traded in. I think they dropped the trade in value of everything recently so if you trade in games even with the bonus you are really getting screwed. Stay away from this deal, it stinks.