The gun "can shoot down airplanes." --Rep. Henry Waxman
The bullet from this gun "can pierce tanks and concrete bunkers." --U.S. Rep. Rod Blagojevich
The projectile from the .50 caliber rifle is "capable of piercing light armor at 4 miles." --Senator Dianne Feinstein
"The weapon can penetrate several inches of steel." --Senator Dianne Feinstein
I use it in the ASAT role myself. You have to lead those communications satellites quite a bit though.
Do you prefer the full mount or just the solar panel mount?
Those you don't have to lead, they remain stationary. (Well the actual dynamics would be a little more complicated than that :) But since they orbit at 22,000 miles it would take quite a lot of "gun" to shoot them down.