I have used CreditKarma for DW's and my scores for about 9 months now, since seeing it on Clark Howard's website. The scores have been accurate, when we have gone to apply for credit. There is no catch, the site is full of ads for secured cards and others, but it's not pushy. I've had no pop-ups. They are also soft-credit pulls, similar to when you apply for insurance, so checking your credit score on CreditKarma does not lower your score.