The stiffest flexon tongue with the high cuff is actualy as stiff and langes plug boot, so to say the flexons are soft in all of their makes is just wrong.
Flexons in my opinion are the best boot ever made, switching out liners and such they can literaly fit every foot type and their flex is second to none. Just by switching the tongue you can go from soft as a touring boot, to stiff as a race boot...its really quite ridiculous. The only problem with them really is that raichle is a cheapass company and could never figure out how to make a buckle that wouldn't break. Hopefully k2 does something with the molds because they are an excelent boot that just needs some small improvements, some of which the kryptons have picked up on some of which they havent (weight in particular).