EAC's secure mode is the best ripping around. It will read every piece of data twice and compare the two to make sure it is getting a perfect copy. If they don't match, it will keep reading it until they do, or until it gives up. Yes, that makes it twice as slow as the alternatives, but isn't peace of mind worth it.

If you don't do it that way, I can pretty much guarantee that you have a problems with one of your rips somewhere. No CD drive ever made rips perfectly, especially if the CD is dirty, scratched, or is of low quality (common with classical music CDs for instance). If you don't have some kind of double-checking like this you have no way of knowing if there is a problem.