Ok, I have been watching this thread for 2 /3 days now and I will bite.
Look up Rosie Chee Scott's blog/review on Shred Matrix. She has written a good piece on it.
I stacked Lean Xtreme and Shred Matrix together with AT2.
I do not know, what it was, but it worked, so I cannot identify what helped me lean out, but it did. I am really sensitive to stims, and I found Shred Matrix bearable for what its worth. I liked its clean energy of sorts, if it can be called that.
If you are aware of how the stack really works, I recommend moving in LX or Reduce XT with it. Then it would be a good stack. If you want a better stack (power/stim) wise then take up FatSmack XR or something which is stim-strong. I prefer stim free.
I wonder how a stack of AAv2 or DCP would do in that bunch as well, instead of LX /R-XT. Never tried it, sounds like something I can run later this year.
AT2 is one of the better products around, I am a PES fan of sorts, Round 1 worked wonders ( i had a lot of fat), Round 2 (did not work), Round 3 (works in spans). So I am going off AT2 and let NattyV or someone come here and run the master class on that.
Shred Matrix is good though, for a non stim-ish Fat burner. People often argue that what you lose is water weight, I am not sure if that was true in my case, when I went off it, I watched what I ate, and did not bloat up like people here and in other places mentioned that they did.
That's my two cents!