Do they work?

I havent got a conclusive answer from our manic guild tries.

This really, really does not need to be its own thread.

Short answer: Sure, Spell Lock will interrupt a cast, the same as Counterspell will. But warlocks generally are going to have their hands full with CC at that point. It'd take a small god to catch an 0.9sec cast-time spell while you're banishing and fearing abyssals.