I think the list is going to be quite strong.
I have been running 5x mangler M3a's even before the +1 health fix (that buff was insane... ) and doing extremely well (winning kit tournaments) the list is feared locally as it should be (used to absolutely eat dengaroo for lunch).
The bomber list really brings more of the same, its downsides compared to the M3a list is you cant fire your 3 dice attack after k-turning, your movement dial is a little worse, spending your focus on d-fence costs you more offence, and less sweet sweet crits. However you gain 2 hit points per ship potentially increasing that first round staying power.
I do not know if its better then the 5x m3a mangler list but i am sure game to try.
I am going to go on the record now saying its a strong list, and one i plan to crush people with. This list, like the m3a list, will devastate 2 ship lists they simply do not have to total damage or hit points to compete against this. If this list is flown by a competent pilot it will wreck things.
People who say this is a bad list have no idea what they are talking about. Fear my bomber swarm.