Worked great until we received several duplicate charges on our credit card to recharge our shipping account (one was 4 times the usual $50 amount). We tried for 3 months (including several phone calls) to fix. Every time we spoke with someone, they promised "a manager was looking into this and would call us back". Never received a return phone call.
If you have a credit card on your XPS account, you can't delete it unless you are adding another form of payment. Not good.