According to them you should not buy that to fix BTF.
From that link...
"That said, Glock pistols are well engineered, so if you have one that will not function with OEM components, something is out of tolerance. The root issue should be identified, even if installing the H.R.E.D. resolves the problem."
I don't agree. I feel the issue is nothing more than the new RSA's being too strong. Of course they sort of agree (slide velocity) if you read everything they write about their part. They just address it a different way than going to a lighter recoil spring assembly.