I bought two of the scouts and I honestly can't see why I would reroll them. 2/3 perks are great, 3rd could be better but isn't useless. Compare that to a Rad Fury launcher roll I got; tripod/field scout/clown cartridge - you aren't getting more than three rockets in a reload, so the last two are a wasted slot.
I have the shotgun, a hand cannon, launcher and two scouts that I can play with and 18 motes atm. Can't get too picky.