thank you very much. kinda disappointed that it's not that impressive specs wise.
That depends on your level when you do the mission. The reward scales with your level so if you do the mission with a low level like Lieutenant you get a version that is quite weak. But you can repete the mission each time you level up to the next rank and the stats of the shield you can get as a reward will increase as well.
I got mine with admiral and still use it on one of my ships. It might be not as good as other set items but it is quite good, at least for PvE.