hi..
that Capital One SmatLine card is a great card. it does have a low interest rate of 5.99% for 3 years but take note that you must pay your bills on time. however, if you wish to see other cards that are more or less of the same benefits and features of the card you have chosen then i can give you a link.
here is the link:
/low-interest-credit-cards.html
make sure that you have excellent credit history to get the card but if in case you haven't reach such level then you can check out the Capital One - Gold MasterCard 11.99% Guaranteed for 3 Years (as long as you pay your bills on time)!
it do have the same feature of Capital One SmartLine but the only difference is the interest rate which is at 11.99% but still this is considered low compare to other credit cards. i also have another card to endorse and that is the MBNA- Gold MasterCard®- Fixed 9.99% AIR which is also one of the finest low interest card.
Compare these cards from your chosen card. im sure you will see and decide which card really is best for you.