The Cursed Gun in Borderlands 2

I just played an optional mission in Borderlands 2 called The Bane and as the mission reward I got a cursed gun called as the Bane itself. The Bane turned out to be an SMG and since it is cursed(my opinion), it immensely reduces my movement speed whenever I wield it. It also got poor accuracy and the only advantage I can see is its high damage potential.

So I thought about selling it but I just needed advice from somebody who already beat this game.

1) Should I sell the gun?

2) Do the drawbacks outweigh the advantage(s)?

3) Will it become useful later in the game?

I'm playing as Zero, the Assassin and because of this I haven't quite used SMG-s. So if there are some plus points I'm not seeing in this cursed gun, please let me know about it.

The Bane is almost completely useless, as well as being incredibly annoying.

If you can handle the annoying sound effects, it can be useful when playing as Anarchy-spec Gaige, or when you want to unload a lot of damage into a large enemy at point blank range. Besides that there's no reason to keep it.

It can be very useful during fight-for-your-life time because you can't move very quickly anyway. The accuracy starts off pretty good, and generally improves the more shots you fire (since it's a Hyperion SMG). Wiki