Just to add my two cents, Ive had my amazon store card for almost a year, and had no problems at all. I was orginally given a 2k credit line and called and increased it to 6k. Promotional offers and statement credits have been flawless so far.
@Anonymous wrote:
@Anonymous wrote:I should note that I'm feeling a little irked at having the whole $99.99 annual Prime fee dumped on my card at once, which pushed my balance and utilization up so that I'll have to be careful for the next month or so about how much I put on that card until I get the fee paid off again. I must obviously have misread the terms, as I had been under the impression that they'd charge me on a monthly basis.
You can choose either option - the selection is made not on the card, but from within your Amazon account at this link. If you change to monthly immediately they should refund the annual fee and charge the monthly one.
Note: it is about $30 per year more expensive to pay under the monthly option
Yes, I see that. Hmmm. I'm really not sure I want to pay $32.88 more per year just to have the illusory benefit of paying "less" per month. I'm just annoyed at myself mostly, I think, for not having read the terms more carefully. May as well get on with it and start watching "The Man in the High Castle" to justify that money. 
Haven't had any problems with the amazon store card at all. Didn't use it for some time and got $600 CLI. I use my Chase amazon as I like saving up points than a statement credit - though honestly, it doesn't really matter either way. One thing that is great that the card *Sync amazon* has is sometimes they'll have offers to give 10% cash back on certain purchases on amazon. I think a month ago it was instruments for 10% back. Not too shabby! 
