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. 1 e1 C5 `1 i$ X' P: m; J2 e$ g0 {+ ?+ n, F; D
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.