i only have a few of the x2 colorants, most of them i have in other colorant lines as well (mostly lureworks, which in most cases i like a little better) the junebug is the best junebug i have used, most others discolor really easily, but the X2 stayed the same shade through multiple reheats the one time i tried it, i used it in hard plastic for to make tubes and craws and both of those molds that i have dont take much to shoot so the ability to reheat more is very appealing in that color, plus 15 drops in 6oz of plastic makes a nice deep dark purple.
i have black, white, red, watermelon brown, green pumpkin green, pumpkinseed, and midnight blue as well, i havent used them all yet but the ones i have used are good stuff.
as far as recipes, i havent mixed them much but as for single color stuff, start with less colorant and add till you like it, if you just dump it in and it gets too dark or thick its much harder to change