Use before the 30-day return deadline to make sure all the cards in the multipack work.
Bought several of these for a staff appreciation event at the office but didn't find out until later that most of the cards worked while some did not.  Some of our staff didn't try to use them until weeks later only to find out they were bad cards. You only have 30 days to report a problem or return so we lost our money.
Rating: 2 stars