The Hilti is nice. I like the setup. I don't have one only because I can't justify buying another collated screw gun since I already own the Senco cordless version.
The Senco works OK and the screws (duraspin) are EXTREMELY readily available which is a big selling point. They are also available in a large variety of types. The gun is only OK by me because they farmed out the cordless part to Ryobi and the batteries just suck.
AFAIK, only HD sells the Hilti screws, they ain't cheap, and they only have a few varieties on hand.
Look for any gun that uses Duraspin. I think Makita and Grabber make guns that are Duraspin compatible.