Ok I can help out here. Im in the middle of comp prep at the moment and am running Mast E/ Tren E and Primobolin enanthate. All I can say is at week 6 which is where im at now I am so much harder/vascular than I have ever been.
Now I don't play to much attention to what should/shouldn't be run together or bro science on the internet but instead do most of my own research while listening to all valid opinions especially from the vets on boards like this.
What I can tell you is for me this is a awesome stack and I will run it again for sure, I should mention there is also a test base in there as well.
Bear in mind though my diet is really tight at the moment and no stack in the world will work effectively without the right diet in place.
I would say if you have run all compounds separately and had no issues, you could run them together and maybe pleasantly surprised.
I have posted a video up in the members pictures section under Stirated 7 weeks out from this years Australian tittles if you want to have a sticky.