Used it a few times before. Mixed results. The deciding factor is the source/supplier. I've had some that I'm sure was fake or at least massively underdosed. But, when it works, it works pretty well for certain things. It can help with the shortness of breath when running Tren for some people. Helps out with cardio endurance and fat burning when cutting.
Overall, it's nothing game changing, and can be expensive. Easily faked and no real way to test before using. Can be effective, but not a great cost vs benefit ratio. And may have the potential to cause cancer, but the jury is still out on that. A reliable source is key, but even then fakes are common.
I wouldn't use it again, but mostly because I don't trust peptides or peptide suppliers in general.