It doesn't work that well for everyone. I've had a credit card for a year and a half, never missed a payment, never went over my limit, always pay off the card at the end of the month, have thousands of $ sitting in the bank, and my credit score is 600. My credit report shows 0 negative accounts yet my score is rly terribly low. Maybe I need a 2nd card or something.
It's really boned me in trying to buy a car cuz all the companies I went to (Ford, Nissan, Chrysler, VW, Toyota, Honda) are asking for a 790 rating or a co-signer. (at least in Cali, dunno about other states) When I buy a car next month, I'm going to have to put 50% down cuz that was my only other option
