In reply to dek:
First pair were at the advertised stress points behind the front points, they never broke but the stress cracks that would have lead to failure were there. Boots were b1/2, (salewa ravens,) so not particularly bendy.
Second pair had the rivets that hold the front bale on smashed to bits by the dynafit inserts of my touring boots, they were quite new and the dynafit inserts had a little ridge to locate the pins on the binding. The ridges finished off the rivets on new crampons in about 3 hours of front pointing. It would have been nice to know seracs with plastic front bale weren't compatible with dynafit inserts on ski boots. (But not entirely relevant to the ops issue, so apologies for anyone I've misled.)
Just to quantify, I have broken my g14s twice too, both in the frame behind the secondary front points. They were c3 type, used with Nepal's.
My gf now uses the g14s, I have the seracs for summer alpine and have darts for winter and the touring boots. For the op, g10s will be fine for what they want at the moment, though I still recommend going out with someone who knows what they are doing the first few times. I've had friends do fine on grade V ice routes in worn out summer walking boots and strap on crampons.