The negative offset would push the wheels further out from the wheel well ( sticking out from truck ).
Installer said this was illegal in Ontario ( debatable, certainly not enforced by the looks of some of the Dodge Rams around here )
Secondly and most importantly I was worried about increased stone chips along the sides of the vehicle caused by stones kicking up and hitting the character lines around the window box and fender flares. ( The tires extend to the very edge of the wheel well now, and I've already noticed an increase in heart breaking chips in these areas )
As long as you can get passed this issue, I do agree the Di*k Cepek DC-1 is a sweet wheel, and reasonably cheap too.