Here's my take on Halbert, and a few nuggets on his copy and the man.
1. I have a one-eyed cat named Halbert. Yep, named him after Gary Halbert. So no, I do not despise Gary Halbert, nor am I talking shit on him.
Halbert's copy for products works well for a one-time transaction. Like liquidating old products. If you run a small used car store, and you have some ancient inventory...
The issue?
This copy sells but it's short-term. It can cheapen your brand.
Now, we could say Halbert's method is still used and still sells. And you're right. Frank Kern, Ryan Deiss, Perry Belcher, Agora, and countless use Halbert's formula. So how is it not robust?
Zoom out a bit. Look at the business aspect.
Again, I'll clarify, I deeply respect and admire the man. But he comes with a lot of complications.
8. I'll leave it here, Halbert's copy is good to know..