I'm not sold on Aliens, however, I'm willing to listen to new and untested technology.
Imagine what the B-17 crews must have thought when the Me262 first thundered into their bomber stream and unleashed hell at the blink of an eye.
In this day and age, we take for granted that we carry super computers in our pockets, we have self driving cars, robots that can engage in conversation, and a working Plasma engine that could make a spaceship travel to mars in about 39 days...