So what is this useful for? On two maps in specific, Bind and Ascent, there is a particular Turret spot that just drives you nuts. Bind B Site on the Box and Ascent B Site on the barrels by CT. If you place your Gravity Well correctly you can PULL IT OFF the object it's on and behind cover, rendering it pretty much useless.

BONUS TIP: Gravity Well can stop Raze's Roomba from reaching you as long as you're out of reach; it stops the Roomba from moving once it reaches the center of the Gravity Well.