So I think I'm going to purchase a mac through Barclay. My understanding is that if I pay everything before the deferred interest period ends then I will not need to pay interest and so Barclay doesn't make any money. Is this true or is there some kind of catch? My plan is to get the credit. Pay the minimum monthly balance and then a year from now pay everything else off at once... once I get a decent sum of money next summer. Do they charge you anything for giving you credit or do they hope that I will make a late payment or go past the promotional period? Thanks!