I take your answers as ruling to refer to, so it definitely helps.
The problem with the spell, I think, is the tendency to use it as "Dispel Magic", to end any spells' effect at any time : )
I would follow how its depicted in the books & movies – sometimes the spell you're trying to end is too powerful, sometimes the caster isn't skilled enough, sometimes a more specific counter-spell is called for: https://harrypotter.fandom.com/wiki/General_Counter-Spell