Mod Version 2.1a

HF Blade (Tier 1)
Damage: 4
Crit Damage: 2
Crit Chance: 10%
Armor Pierce: 2
Stun Chance: 2%
+2 damage when slashing robotic enemies
+1 Mobility

HF Blade (Tier 2)
Damage: 5
Crit Damage: 2
Crit Chance: 10%
Armor Pierce: 3
Stun Chance: 4%
+3 damage when slashing robotic enemies
+1 Mobility

HF Blade (Tier 3)
Damage: 6
Crit Damage: 2
Crit Chance: 15%
Armor Pierce: 4
Stun Chance: 6%
+4 damage when slashing robotic enemies
+1 Mobility

Higher tiers are unlocked when you buy the coresponding sword tier. There are no additional costs.

Stats Config ini file is located at
..\Steam\SteamApps\workshop\content\268500\1197817577\config\XComMGRBlade.ini

Other configable stats include panic chance, burn, disorient and extra damage against organic enemies.

There is a config value if you only want cosmetic variants which have no stat difference to the vanilla swords (ie. Sword, Arc Blade, Fusion Sword)
just set
bHFBladeIsCosmetic=true
(Default is false)