Foundation Repairs

I was happy to get a concrete foundation in the house we bought a year ago, but since it's really 3 separate foundations, we're anything but immune to cracks. We had one filled with concrete. But, I'm suspicious as to whether that was the correct decision. A more flexible material like butyl rubber would probably have been better. I just learned of another option: Crack-X. Crack-X is a company that specializes in concrete foundation cracks. They use an epoxy injection which effectively welds the two parts together. Will have to keep them in mind in case we have another crack to deal with...