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. $ o& ~; a9 }/ ~7 s$ ?; y; [ 1 b4 M9 i* E: ^7 K. `3 Y+ Zbut 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.