My experience is that it is similar to the fuzzface, but more controllable and less woofy in the bass.
The only downside is that it is less expressive than the germanium number. A Ge fuzzface gives mild then strongly asymetric clipping as the signal strength goes up, before moving to full-on fuzz. So it is very sensitive to playing style, especially with single coil pickups.
If possible, grab some low hFE transistors out of an old hi-fi or radio. Modern 2N3904s and 6s have hFE over 300, but the old ones seem to be around 200. A 2N2222A might be a good modern alternative to the 2N3904. Check out charity shops and rubbish dumps for 1970s hi-fis.