I used it big time (probably saved over $500 from this... b/c their system is messed up, if the price was lower even before you bought it, you can just say price drop to x price, and they will honor it, if they had that price within the past 30 days... but you need to look at the price history...)
you can always return the item (with shipping on them) and buy the item again
(and I would not be surprised if you told them this, that they would do the price adjustment)