It has a slow swing speed, but makes up for this with high damage. With a well maintained super sledge, enough melee skill, and Critical Hits (Sneak or otherwise), most enemies can be killed (including super mutant masters and Enclave soldiers) with a single hit.
The super sledge can successfully strike about 600 times from full condition before breaking.
Super mutant overlord super sledge - Carried only by the rare melee-equipped super mutant overlord, this version has an object effect which inflicts an extra 25 damage per hit when used by non-player characters against the player. This damage ignores Damage Resistance and is independent of the condition of the weapon. This version is otherwise identical to the standard version of the weapon.
In the Operation: Anchorage add-on during the finale battle with General Jingwei, two power armor troopers can be seen wielding super sledges. These troopers can be disarmed. Their weapons disappear quickly when loose on the ground, but it is possible for the player character or an NPC to pick them up.