There were only a handful made. IIRC it was 6 or 7. A local guy way back had one but never ran any times.
I know some have stated it is the "best IC evar!!!!!" and some people did run some impressive numbers years ago with them, but compared to newer ICs, I dont know. Ive never actually seen one in person.
I know a couple had fins milled on the outer case as well. Dont know if that helped with anything.