Credit Score goes from 500-860. This method 'may' give you a 810 rather than an 805 when you're 25. So you pay a few dollars of interest EVERY month for 7 years for 5 points when all you needed was a 720 to get a new home.
In the US, the FICO (Fair Issac Corporation and the one most commonly used by the mortgage industry) ranges from 300 - 850. I didn't know my credit score until I applied for a mortgage a month a go. I knew I had a pretty good score, since I've got a spotless 13 year credit history -- no late payments...ever. I've always pay in full before the due date. I finally learned my score after applying for a home loan ... 830
A credit score above 760 will get you the lowest rates (~5.78%), 700-759 (~6%), 660-699 (~6.3%), 620-659 (~7%), 580-619(~8.5%), 500-579(~9.5%). Below 500 that fat chance of getting a mortgage loan. How much does a few points of interest makes? A $100K loan paid over 30 years, the difference between highest ($302K paid) and lowest ($201K) is $91K. Ninety-one grand more for the same thing, because of bad credit.
The bottom line, if you want good credit. Pay on time, every time. A few late payments won't hurt your score, but not paying a debt (even a $20 one) will do to your credit score what John Rambo did to the Burmese Infantry battalion.