I have used both kits. I have used 6 of A's and 8 of SD. The only difference I noticed is the oil is a bit darker in the SD kit. AS far as pain, niether kit bother me as much as teston 250(that did not bother me much either). Im wondering how many of the guys that experience all this pain have removed oil from the kit to make a stronger tren? If so the alcohol to oil ratio is up. Hence, pain. The first A kit I used, I did not crush the pellets and they took a couple days to disolve. Now I crush them entirely.(fragments take about 15-20 min to disolve) The only time I noticed a major diference in color is when I heated my tren(it got much darker) I dont even heat it anymore. Its an unnecessary step. Between the acohol and the syringe filter....Its sterile . Since the boiling point of alcohol is so low, I suppose one could put a needle in the stopper, heat the mix, and evaperate some of the alcohol.(several have done this with the teston) I have had nothing but success with both kits but, perfer not to wait on A's which has take upwards of a few weeks at times. Thats my experience.............The Freak