They should get you at least 100k miles unless you're hauling or on rough roads all the time. After 100,00k it's up to Murphy. I have been stranded before which has made me big on preventative maintenance. If you have the cash and time, I'd go for it. 100k is a time to just replace all the suspension bushings, ball joints, struts, etc., then go get an alignment and be good for another 75k on the components at least.