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. $ ~8 M3 m4 @8 E6 m# g2 F) E 4 x" s% M6 t7 _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.