Though it's not my favorite plugin, it can do the job for you sometimes when you want to make a kick/snare sound sharper. But sometimes it will play around with your track and screw the whole thing up! But in my opinion it really is good at times!
A good sounding transient shaper, but just not my cup of tea. The ones I typically use have attack and release controls, which puts them far ahead of Flux in my list of things I use a lot.