I don't know any ins and outs as I never contracted through them but the setup is not quite the same as the old BRK Irish mess and, more importantly, Storm is a genuine agency which has only a part of its business placed with RYR. The fact that BRK did 99.8% of its business with Ryanair I understand was one of the big nails in its coffin from a tax/self-employment point of view.
Of course, Ryanair being Ryanair, Storm contracts pay FOs a lower rate than the Brookfield ones did. They haven't dared change the rate for Captains.