Jepp i´ve used them and they are great real primo! Louyang is a good company i have used there Testo prop also and they make real Parabolan(trenbolon Hexabenzylcarbonate)and other good stuff.
I used Primo/Test Enanthate for 12 weeks to tell you the truth i dont remember how much i gained but i know that i kept almost everything atleast 80-90%of gains.