The NBT are last years dynastars I think,
they may not have the spring blade either,
it either lastyears TM's or the older green tm's
the flex is great, duribility wise they are fine, sure the edges are a little weaker then other companies, but if you detune them properly you will be fine. Core duriblity wise they are great, and that is where the life of the ski comes from.
Yes, they can be mounted anywhere and they are softer then the Tm's not stiffer.
They are great skis and stop worrying about the fucking top sheet, you buy skis for how they ski not what you can re-sell them for.