The sleeper is much better than Gjallarhorn and Black Spindle for damage. Plain and simple. The Gally did about 8700 damage to lets say phogoth right? And then the 8-10 wolf pack rounds which did about 292 damage per mini rocket, so that's around 11,620 damage so times that by 7 and you have 81,340 damage. Yeah it was great, but with the exact same amount of ammo the sleeper does nearly 17,000 per shot, 17,000 times seven you ask? 119,000 damage. It's a lot more. Against Atheon Gjallarhorn did about 14,000 damage per rockets and the wolf pack rounds did about 570 damage per round, so that's 19,700 damage, so that is 137,900 damage. Sleeper stimulant does 63,353, that's a whopping 443,471 damage. And if you get boots with fusion rifle ammo (like me) then you get 9 shots which is 570,177 damage to atheon. To skolas Sleeper simulant does 13,229 damage to skolas, so with 7 shots that's a total of 92,603 damage. Gjallarhorn did a little under 8,600, so times 7 with wp rounds that is 80,640 damage. Sleeper is better, period.