i used to use quite a bit, for one reason or another i haven't used it in awhile. never tried the intrain, but from what i hear psyko is the improved version. i was curious and opened jug, it smells fantastic. the jug is 597 gms and the scoop is pretty big, don't think i would be tempted to use more than 2 scoops at any time. i am off work tonite and today was a off day from weights, cardio only. going to put it to the test tomorrow with weighted stairclimbing-21 flights of stairs wearing 5 pound ankle weights, going to go for 5 trips-hopefully, lol.