On hard, glass cannon is very punishing. My 20 lvl Jahan had ~300 hp with glass cannon on hard, and pretty much any enemy was able to one-shot him. One bad move, and you have to use res scroll or reload save. AP bonus is nice in some situations, but as this game is ridicolously easy anyway, I won't take this talent again. After finishing Cyseal, you will probably never need more than 2-3 turns to finish all enemies except bosses. Taking glass cannon is only an annoyance, you will finish some fights little faster, but you'll need to be far more careful.
