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. 2 g! ]/ l1 _: r% V1 c' `2 Y) n3 a# i$ T
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.