Russell, The principle of the flex stem comment related to the bike not the suspension medium, the principle of the flex stem is not the elastomer (otherwise RC35's and Manitou's wouldn't be cool) but instead the principle of the flex stem is a hinged pivot and all the inherent weaknesses of such a thing to only acheive a limited amount of travel.
I think that the original proflex bikes were real trail blazers and did a lot in the early days to help full XC suss on its way. Volvo invented the 3 point seat belt which has saved countless lives, Volvo's are not cool per se. QED... Proflex are not automaticly cool just because it was a good idea.
Now the Boulder Gazelle is cool but that's another story!
Somerset, like 'Heartbeat' with newer cars!
Retro MTB: 1992 Cannondale M1000 Deore XT M730. 1992 Raleigh Dyna Tech Quantum Deore XT.
Retro Road: 1992 Eddy Merckx Corsa Extra Telekom Shimano 600 STI. 1993 Dyna Tech Ti Campagnolo Athena 8 Ergopower.
Modern: 2004 Wilier scandium Ultegra 6600. 2014 Wilier GTR Ultegra 6800.