S Zeta is one of the most powerfull scissor units IMO, it has a really nice beam rifle, THOSE HOMINGS, powerfull melee, its skillset is just amazing and it has a long range beam and a dash attack that STUNS (u MA? f*ck you).
the only cons i can really think of it is that it's really fragile. S Zeta is a true scissor unit, it has everything
when skills activate it's boost and agility are just insane, making it really deadly in the right hands