GREAT thread idea Martin!
Since price, and/or perceived value is not one of the terms of reference, it puts absolute performance as the single criteria.
Products which I feel are perfect, regardless of high or low prices, which do EXACTLY what they are INTENDED to do, and based on my own use experience, would include:
EDIT to add: I don't believe that I've EVER used THE perfect (fill in the blank), but of what I've used...
Grohmann Russell model knives (#1, #4, and Mini-skinner);
Lee Dies, case trimmers, and Classic Cast press with primer feeder/seater;
CZ 452 rifles;
Fox whistles;
Silva compasses;
Sierra MatchKing and GameKing bullets;
Hodgdon powders;
CCI primers;
CCI Mini-mag ammo;
Leupold VXII and VXIII scopes;
Rivers West clothing;
Drop Zone clothing;
Danner boots;
Bailey hats;
Savage rifles;
Dewey cleaning rods;
I'll add to my post as more occur to me!