I know a couple of people who have used them for simple divorces, the kind where they basically agreed on things & just needed someone to help them flesh out the details & put it into writing.
I agree that it can be worth a shot but in your situation, I'd stay open to lawyering up. Your AH has shown such incredible manipulation & narcissism & is actively drinking - tread lightly, there's no telling what may set him off or how nasty he'll get as all this talk becomes reality.
But let's talk about you for just a second.... YOU are showing major strides lately, Lady! Stay strong, you're doing great!