Landon--See the Hireko DSFI page 181 has the Spectre Lite L and A flexes and page 182 the R and S flexes.
That shows how they can be used in a fitting and build out and how they compare to other steel shafts of the same like.
I use the rebadged Spectre Lite (Swing Science FC-One 950i L/A and R/S) in utility irons and mid-irons for those that need a bit lighter steel where graphite is too light and std. steel too heavy.