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. : K# d- x; r5 Y& P( T1 B+ S* K, `! s% B. ^5 x- x
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.