I was going to use deca on my first cycle, but after a lot of research, I decided to go with primo. A few reasons: primo doesn't aromatize and deca can, deca has progestogenic activity, deca is detectable for up to 12-18 months, deca causes more inhibition per any similar dose than primo, the list goes on.
I finished my first cycle moth ago and it was Deca only. I used Norma's Deca 400mg per week for 8 weeks. I gained about 5 kg, but most of it was just water. I had decent strenght gains especially in shoulder press and only side effect was facial acne. No dd, but facial acne is not fun at all
Í will start use real mass builder=testosterone on august. I will stack cyp, enathatem eq and probably propionate.