theoretically it may affect your credit scores; however, in my experience, it does not make a big difference. I've canceled a couple of credit cards, when I apply a mortgage, I still got a good rate.
not bad. : ~6 e( l' L7 T9 S) V" y1 S2 ]$ J6 H8 E; k# ]- u+ V: Q
but compared with other rewards cards, the rate of getting points is not good enough. But if you buy things a lot at their stores, it is very good.