I have run myosynergy and loved it, I'm sold on the -epi but its the prop blends that concern me.
The reality of supplements, being unregulated as they are, is that there is no way of knowing what you're getting vs what is claimed (short of 3rd party lab analysis). So it really comes down to your trust in a brand, or the testament of others that they were satisfied with the results of their trial.
We're currently out of Myosynergy it appears, but if you're worried about EpiCat for some reason there's plenty of testament on AM that BLR's Follidrone is great stuff, as well as OL's Ep1c. They're all priced about $50 for 60 caps of comparable dosing more or less. I wouldn't fear Blackstone though; I intend to incorporate 2-3 bottles of EpiCat before long when I can afford to pick some up.