I've got 3 Prestige on Heavy gunner and I love the class but, half the class evolutions are straight up troll picks.
Popcorn box just straight up kills you (and your team mates) right as you spawn into the stage.
Metal Storm also feels useless combat wise, but god forbid you dodge back from a new swarm of enemies, also a team and self killer.
Most of the time I am praying I will get a option that won't troll me, Just let me not evolve instead of having to pick from two options that are both a detriment to my run.
Also it kinda sucks that Belt feeding requires an active reload, so it is mostly useless with the Twin Gattling.
Meaning you barely have decent options for evolutions.
Edit:
My conclusion on the thread is:
Popcorn box has to go - rework or just remove it;
The rest can probably stay if popcorn is gone.