Just a reminder, the charge must be at least $25 to be eligible for the purchase eraser. So, an Amtrak ticket (or any travel-related) purchase of less than $25 charged to the Barclaycard Arrival will not be reimbursed at the higher redemption rate. These qualified travel-related redemptions also come with a 10% points rebate. So, if you erase a $100 charge with a 10,000 point redemtion, you immediately get 1,000 points back in your account.
In addition to the benefits amamba mentioned, I like this card because ALL charges earn 2 points per $ with no limitations. Travel-related charges of at least $25 can be offset by a statement credit at the rate of a penny a point (1:1). All other charges can be offset by a statement credit at the rate 1:2.