I only have a couple colors in the X2 so far. One is the chartreuse transparent. With the regular formula colorant I had to use 110 drops in 3/4 cup of plastic to get a nice rich color. The X2 colorant gets the same results in about 22 drops in the same volume of plastic. I honestly think the X2 is richer in color period. The other color is red. In 1/2 cup of plastic I need only 8 drops to make it look like blood.
Personally I think the switch to the X2 is perhaps the biggest up-ward step I have seen, outside of the molds, here at Caney Creek.