There's no doubt the surftech's are stronger - the amount of abuse I hand out to a board by nature of my many bony bits destroys poly boards rather quickly
![Embarassed :oops:](./images/smilies/icon_redface.gif)
The couple of surftechs that i own have stood up very well despite constant (ab)use.
So it stands to reason that when they do eventually let go (no board is indestructible) they do so with a much bigger bang. They're also a lot stiffer (less flexy), I think by virtue of the thicker glass/PVC/glass skin.
Not sure if this greater rigidity is a good thing or not. Haven't ridden enough different baords to know. Plus, my surfing is pretty poor at the moment.
My thinking is this: the greater bouyancy and rigidity should at least have resulted in a change to the design of the rails, but it hasn't yet.
I think a quite a few of the tuflite shortboard shapes might suffer from rails designed for the less bouyant and more flexy PU/PE materials. Their rails carry too much volume for the greater bouyancy of the new materials, resulting in the "corky" feel many comment on. If EPS/epoxy sandwich skin ever got wide acceptance by custom shapers, I think you would see a thinning down of rails.
Even if this is sorted out, though, the question of whether EPS/Epoxy sandwich can be adapted to supply the amount of flex designers and pros want is still open.