I consider it a pretty good deal since I have used the service on items posted here. My credit card company (several I'm presuming) provides price protection up to $500 per purchase up to $2,500 annually. If you find the item for less within 90 days (at a non auction site) they will mail you a check for the difference. The paperwork is pretty much like applying for a rebate... scan and email a few pages to them.
Makes reading the deals here a little easier when you just purchased it a few days ago!