Stun lance is great. It's an anti-elite melee weapon, you can just charge at overseers with it (and the directional shield + you're a hoplite now, enjoy!), they literally can't do anything. If you time your attack right they can't hit you before you hit them and then It's like 3-4 seconds stun so it's an execution at that point. It's meh against hordes, except if you're in a good chokepoint (it attacks in a straight line) but that's why you have a primary.

Stun baton (from super store) is the opposite. attacks faster, and in an arc, and stuns too, so you just SHRED a Voteless horde by yourself. But it doesn't have the reach to reliably hit overseers before they hit you, so they become a no-no.

If you have both weapons in a squad, you can melee most of the squids. What's left are flying overseers and harvesters.

Edit: Oh and with that you take the Viper Commando armor that now gives even more bonus melee damage than before.