These make pretty good CL22 pets, but their ranged attack may cause more trouble than it's worth. As a Rifleman, I usually want my pets to melee incoming mobs so that they'll stop barreling down on me, but the rats just stand their ground and spit at the mob while it chases me around. If you need a decent tank, these rats can fill the role, but they're not very good at grabbing agro to make a mob stop and fight them.