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. 3 ~7 Y4 c1 `2 `, a& g; M3 P; k8 [) I& j5 y& m ^$ K/ J n
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.