I dunno.
They seem like a good idea until you actually use them, and then they tend to become irritating due to the slow recharge rate/puny recharge from SCBs.
I fit 'em to all my cargo ships, passenger ships and to any ships that are horrifically under-shielded.
Basically, I really only think they're useful for ships that I don't plan to get shot at.
My Multirole ships all get A-rated shields and my Combat ships & Mining ships get Bi-weaves 'cos I tend to think recharge rate is more important that outright strength.