After the coupon code GRADUATE, the site said it will give me $150 for my curve.
I can easily eBay it for $275 (believe me, I've eBayed many devices... lol). Of course, I will be including the car charger, OEM slip case and rubberized case to the auction, which the trade in program doesn't require. Further I know that the eBay/PayPal expenses will be about $25, so I will net about $250.
So the way I see it, I will be losing about $100 by using the trade in program. Having said that, I am SHOCKED that I can get so much from RIM on this program. That is awesome, but I will likely go the eBay route and see how well I do.