Obviously getting good quality individual compounds and loading accordingly is a better way to know your shots are not under dosed, to a degree.
I however have had good experience with Medtec blends here in the UK.
A blend I highly rate is 50 test p, 75 tren a and 75 mast p per ml.
Anything with outrageous claims and huge mg per ml would probably be underdosed.
If fast acting esters are based around 100mg per ml then there is no reason why they should be avoided.