I have heard excellent reviews on both AnabolicMD's tren, and QFS's tren. Both use pure powders, not pellets. I have not tried either (not really a tren person) ... yet. I know that AnabolicMD cant keep up with demand for his tren, guess he has the secret formula hahaha.
Not to sure about Supra's tren, but they have always been a quality lab, so you cant go wrong there. They defnately arent cheap though.
Mavy