Or oil. I have shaved with nothing but oil in at least two years. To me, it's the great undiscovered, underrated, underappreciated shave prep substance out there. Nothing - soap, foam, gel goo, whatever - is remotely as good on my skin as a simple, cheap bottle of shave oil. Plus, I can see what I'm doing while I shave.
If I use oil, I might as well dry shave. BTDT, worse than plain water. There is also not a single cartridge available that will shave my wire quite as close as the Tech. Some others come close. The TracII works well, and the Sensor is fine and they go down hill quickly from there. You just gotta know how to shave.