Haunted Guns (previously Witch Hunter Guns)
Prior to 2014's Halloween update, these weapons were one of the very worst in the game. They were just like the Dual Pistols, except with lower damage and a better design. But after that Halloween 2014 update came, these weapons changed. They changed so much that even their name changed. If you equip one the Shadow Hunter Braid, these weapons are so much better than they used to be, with much better damage. However, along with this change came the Shadow Hunter Pack, and since that pack has better boosts than the Warlock bundle (the bundle this weapon is earned with), you are probably going to use the Shadow Hunter Guns instead of these ones.
So if you buy this, you're buying it for the looks, because there is no reason to buy the Warlock Gear (which includes this weapon) over the Shadow Hunter Gear.
See my Darkness Combo Guns review for a more in-depth look at the stats of the Monster Mash weapons.
So if you buy this, you're buying it for the looks, because there is no reason to buy the Warlock Gear (which includes this weapon) over the Shadow Hunter Gear.
See my Darkness Combo Guns review for a more in-depth look at the stats of the Monster Mash weapons.
tl; dr
Before the 2014 Halloween update, they were bad. Without a Warlock tagged head equipped, they are still bad. Otherwise, they are decent weapons, but won't see much use as most people will have the Darkness Combo Guns, which came with the better gear.