The Bren 100 in BR4 is like a tractor — loud and slow. There are too many machine guns in BR4 that have a faster fire rate and better stability. Its only redeeming feature is the 100-round magazine. They should at least make it as controllable as the 1919.
I found it much harder to control than a regular Bren. It was playable, though. However, before the one of recoil fixes, it was unsuitable for shooting beyond 2.5 meters.
More precisely, it’s not even that. It’s not the recoil that’s the problem, but the fact that the bullets just fly off in all directions. It’s a very strange feeling.