[Nerual]

One thing that could be inportant to keep in mind is they seem to be making the perception something of battle of wits. Maybe the spell counters take into acount the opponents spell, the opponents level, and his perception. If you knew the opponent was going to counter your spell even, maybe you throw some sort of nasty little suprise into it or something... I doubt that counter spell will be an instant success sort of ability, you must first percieve the spell being cast, then you must try to do something about it. I think the actual act of the counterspell will depend on alot of factors, maybe if you fighting a powerful wizard, you see the spell coming a mile away, but he's just too powerful for you to turn his spell aside.