I know that closing lines of credit does cause your credit score to go down because you have less available credit. So, for that part of it, it will cause your credit score to drop when you close the account. I’m not sure what other effects it may have on your credit, but you may want to be sure you read the fine print about those benefits before you sign up for the card. There may be restrictions that say something about canceling the card and having to return some of the benefits or not being able to use the benefits until you’ve had the card for a year.