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. # q) E6 a4 r: w% n6 r5 f% b. X' [, B; | ?" C+ S/ `6 V* u) v
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.