To be fair, all hoppers have a problem with feednecks breaking. Its only becasue the Pulse is the new hot product that you hear people perhaps saying that is is weak. Im sure halo's break feednecks more commonly then pulses or whatever, you just dont hear about it.
Any feedneck is going to break if you think about, think of the weight of the hopper on a tiny tube about 1" in diametre, you put stress of the feedneck causing the bonds to break in the material.
Angus.