I was pretty much convinced to get a Reiff but then I saw this note (I've got a c-85):
Band heaters will not fit the cylinders on Continental A-65 through 0-200 and 0-300 if there are lock nuts on the cylinder studs. The bands will fit these cylinders if there are no lock nuts. Because the metal HotStrip element must bond to a flat surface, the oval oil sumps on these engines are heated with 3/8" x 12" 50w flexible silicone elements (two if HotPad or Turbo XP System, one if Standard System).
Aren't the locknuts required...they were there when the plane left the factory so I'd think they would be. And having to pay the same price for a silicon heat strip which they say is not as good as their "HotStrip" kinda sucks.
I think I'll just take my wife's hair straightener apart and stick it to the sump with magnets


