The Cerberus breakers are weird, in that they look like a suite but they really aren't worth the influence to play as one. Lady is a badass, but Rex and Cuj.0 can only really be considered in their own faction. Taken in that light, Rex is actually a pretty good addition to the criminal breaker suite. If influence is tight, Rex alongside Passport can act as a not-too-awful Decoder solution. Passport does the heavy lifting on centrals, Rex steps in when there's a remote to be cracked.