Sorry,

when I made my comments earlier I was assuming that
people were discussing exceeding the placarded g-limits,
not the certified ultimate limits. I believe 6-7g would
result in damage but perhaps not failure (depending
on the margins), but 10g, 15g!!!, how the hell do you
get yourself in a situation where you have to pull
that hard?
Personally I think it should be unnecessary to exceed
5g in even the worst spin recovery......unless you
enter a spiral dive and do not stop the rotation, in
which case all the arguments are irrelevant. If you
are in a spiral dive and do not stop the rotation then
you will exceed both the ultimate g-limits AND vne.
Assuming you are a reasonable pilot who can recognise
a spiral dive and recover promptly, then opening the
airbrakes while pulling the 5g or so which may be necessary
to recover below vne will simply result in damage to
the wings, where not opening them would not.
I think most of the structural failures resulting from
poor spin recovery must have been spiral dives.
Again, proper pilot training should ensure that this
never happens.