Ratchit, you know what happens to linearity of silicon devices as the heat is increased, Germanium circuits exhibit this effect dramatically more, but they have their uses as the voltage drop across a Germanium diode is about .15 volts as opposed to silicons .6, which makes them useful for certain things. It will probably be used quiet a bit more in the future only it will be a mix of SeGe, as the two together have superior properties than either one alone.