Definitely $1000.00 worth of extra stopping power.
I have a 2008 Silverado Service Truck. It weighs between 10,500 and 11,500 depending on what I'm carrying. Being 3-4000 over the factory GVW it's like trying to stop a train. I already had Hawk SD pads and slotted rotors which helped and were well worth the money but still wasn't enough for an emergency stop. These calipers made a HUGE difference. I'll be doing the rears as well when finances allow.