Pretty much. Just find reviews on the individual product though.
Some brands of epistane seem to be "less" potent. Depends on how much of it is filler and how legit the dose/quality is.
Havoc has a nice long history. Epistrong was mentioned as well, great one. And there are several others people can recognize easily.
If you have havoc go for it, the other hell try it and give us a review on it!