Countless times. Over 20 duels with a mage and all 20, I got counterspelled every time it was up.
The talent simply does not work. the spell casting part seems to work 50% chance to not affect casting speed, but the resistance to interrupt affects part of the talent does not work.
It’s not just counterspell either. Dueled a few melee (rogs and warriors) and every duel, pummel/kick lands everytime.
Look, I get it, pallys being able to freely cast heals without the chance of being interrupted would be so OP (like anything pally in classic could be construed as OP), but with literally no way of healing substantially without casting, this talent really needs to work. I shouldn’t have to blow a 5 min cooldown to be able to cast