Lord: PvE, it's pretty nasty. Not so much so in PvP due to Matador/Party Crasher instantly gibbing unlike the pulses from LoW however. QBB: Great fun in PvP, not all that effective in PvE though, you're better off just using a regular Fusion Rifle. Dreg's Promise: More burst DPS than Vestian at the cost of Sustained DPS. That said it's a fun weapon to use, recommend Perfect Balance for PvP and Field Scout for PvE. If nothing else look at it like this: "Do you have a Solar Shotty?", "Do you have an Arc Sidearm?", and "Do you have an Arc Sniper?".