I bought the chromed steel unit with an aluminum grill insert. Overall apearance was nice but it needed to be massaged quite a bit to get the grill to mate up with the fenders. Of course repop fenders and core support is what I'm working with so that could be part of the issue. The chrome is also thin and looks to be "cracked" at the sharp corners. I will probably get it rechromed.
If I had to do it over again, I'd probably go with the aluminum unit, OEM if I could find it. The aluminum repops HAVE to be fitted to the truck. It requires quite a bit of force to get it aligned and riveted in place but they look fine after they are installed.