2 weeks ago, I received 3 Kingston 2GB CF cards I won on eBay in a package deal. 2 worked flawlessly on my Marantz 660, but 1 did not. Kept getting a read error. Even tried formatting with my PC, and still wouldn't work.
The Kingston's have a lifetime warranty. So I decided to test it. I went on Kingston's website and filled out their RMA request. Submitted it online, and within minutes, they emailed me my RMA # and instructions. Printed out their emailed RMA form, put the card in a padded envelope, and dropped it off at the nearest Kinko's/FedEx. Shipping is FREE.
Today, just over a week after I shipped, a new card, in factory sealed packaging, arrived from Kingston. Out of pocket costs: $0.00. Excellent service, no questions asked.
Below is the link to Kingston's customer support. Under "Product Support Contacts", choose RMA request and follow the steps.
If you have a problematic Kingston card, just do it! Gotta love Lifetime Guarantee.
http://www.kingston.com/support/default.aspEDIT: *** They require signature at delivery (FedEx). You may want them to deliver at work, if no one is at home during delivery time.