Rated 5 out of 5 stars
OK its a difficult idea to get past, handing all your security to one group of people...
just read up on it and remember a few things:
if you have something you REALLY REALLY care about and you want to be absolutely sure, just don't include it if you don't want to
you can always miss off the last 4 digits of your credit card details and finish them manually if you want to
if you don't want to use this add on you will still be handing over your credit card details to several companies including your verification number several times a year anyway, think about the risk rationally
this add on rocks. I think its worthwhile