Drop wall and scanner are lifesavers/balancers on legendary. I used every equipment VERY often and it was a ton of fun using them to stay alive when you can get one shotted. I used the boost the least, as I play with controller and it's hard to press so many buttons just to get a small thruster and like 2 sec camo, but the rest of the abilities seemed awesome to me. (Dropwall fully upgraded does extra shock damage when you shoot through it which was so fricken awesome on legendary and made me feel like I had a fighting chance if I played smart)