This I know.
I have used only 1.5 and I love it. I use it almost everyday. Two sprays to the back of neck, or one back of neck and one chest. It’s given me very friendly behavior from women. I like the smell too. When I added 2 sprays of 12.5 mcg/spray P79 I have had women turn their heads to look in my direction.
I would have loved to try v1.0, although I don’t see it in the store, as I like being noticed by strangers and use that as my primary method of deciding if a product is working for me or not.