I use the Return Protection and Extended Warranty fairly aggressively - but well within the rules.

For example, if I have a cell phone which ends up with crappy battery life during the extended warranty period (and the original warranty had a battery warranty), I file a claim.

Or a few times a year I buy an electronic toy of some sort (phone, tablet, whatever), and around the 60th day I file a claim for Return Protection.

The result has always been a refund of the full purchase price from Amex, and I get to keep the item as well.

Anyone ever have their card cancelled or a credit review initiated because of (claimed over-) use of these services?