Sorry for Necro’ing but I used this spell for the first time as a PC at the weekend. In 5.0 it was always off the spellcasting list previously because it felt a bit blaggy - particularly if a kind DM lets you know what spell is cast in advance or a bit naff if you don’t.
The new version feels useful and poweful but without being blaggy. It has a chance of stopping a spell. I used it twice in that session, once it worked, once it didn’t and it was used once by the enemy wizard against me. It definitely saved the party’s life though because that fireball would have resulted in a TPK i think. Or certainly taken out 3 players.
I like the fact that it effectively forces a Concentration check.
I like that it’s not automatic and a casters skill can keep it at bay.
I like that it only ever uses a 3rd level slot.