Mixes are a stupid waste of time. Other than convenience what do they offer. The give you a set mix which is not always going to be what you want. if you are too stupid to stick a pin in 2 different vials and draw out the desired amount you don't need to be wasting your time with steroids, you need to go and learn how to bring your intelligence up to a reasonable level.
What is the current word on qfs, last I heard they were in the good books, but things can change fast with ug labs.