Shields have been reworked to add major differences between manufacturers and classifications with the goal of providing a difference in feel and value.
Size 1 shields have had their health pools readjusted and regen reworked. For size 1, shields now stop regenerating on hit and once a set period of time passes without further strikes, the shields will began to regen again. The functional goal of this is to limit shield regeneration during a fight and have the shield work more to stop the enemy doing significant damage right at a fight's outset. There is one exception, ASAS (manufacturer) shields constantly regenerate, but have a reduced health pool
Size 2 shields work similar to before, but now with more difference between manufacturers. At size 2 there is no damage delay, low regeneration, and a large health pool.
Size 3 shields have very large health pools and regeneration rates, with the goal of requiring multiple ships working together to overcome their regen.