Adds 8 (15 counting variations) new turrets for dealing with alien menace, as well as other military-related items. Good compliment to mods that add new biter types, like Rampant or Natural Evolution.
Mods introducing new content into the game.
New ways to deal with enemies, be it attack or defense.
Will the Radar Turrets gain any benefits from the Big Brother mod (scan size, efficency, etc)?
No, they should not. When you research radar tech, Big Brother replaces vanilla radar entity to make it work, so other radars shouldn't be affected.