The general property of electron tunneling into superconducting materials and the information available from such a technique will be reviewed. The advantages of using superconducting rather than normal metal electrodes for IETS will be outlined. Using the Josephson effect, for example, one can profile the tunneling probability along a junction to determine current distribution. Measuring the superconducting energy gap and the phonon renormalized density of excitations the superconductor can serve as extremely sensitive tests of the quality of the tunnel barriers and if, in fact, tunneling is the dominant conduction mechanism. Artificial barriers have been often suggested as attractive alternatives to natural oxides. The quality of these barriers as well as some of the details of the tunneling process can be implied more easily when the electrodes are superconducting. There are various other phenomena which are observed when the electrodes are superconducting and what they tell us about the barrier or the electrode will be reviewed. In cases where these phenomena result in a significant distortion of IET spectra, techniques to avoid them will be outlined.