Went to the local AT&T store to order a 5. Told me that the trade-in value for my 4S 64G would be $270. I think it's not bad... Any thoughts? They also did mention that they would the $270 will be issued in an AT&T Promotion Card that can be used towards anything purchases? Wondering if I could use it towards a iPad Mini once available at AT&T store? Also told me that I need to use the card within 30-days? Anyone had experience with a trade-in? Thanks.