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. # t: R; Z6 S5 j: A1 O2 ~( e% c' Z; K5 {- l$ T6 ^
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.