i have, i made mine from synovex using a's kit. injections are not bad at all, went through 25g no problem, you will gain really fast on this shit though, i ran it with tren and dboll also used arimidex .25mg/ed and had no problems with nipples what so ever, not even an itch, and i used a gram/week of just suspension, along with 50mg/dboll/ed and 500mg/tren/week. as far as the concentration goes, i made mine 100mg/ml