Well, the peppermint is 89% alcohol with some water and peppermint oil. Great for thinning VG.
Strawberry is "Water, Alcohol (27%), Extractives Of Strawberry, Apple Juice Concentrate, Lactic Acid, Caramel Color, Natural And Artificial Flavors, Propylene Glycol, And Fd&C Red 40" so you've got coil clogging apple juice and caramel color, plus the needless red dye.
Lemon is 83% alcohol and some oil of lemon. At least is shouldn't be an issue getting the citrus oil to mix with PG. I doubt it will be easy to mix with VG though.
Basically, compared to what most of us use, the stuff is incredibly weak. Tends to contain ingredients many of us avoid too.
I won't say, "don't use it", but just remember if you do, it's completely different than the flavoring most here are using and we'd be of little help in helping you get anything worth vaping out of them.