Crush: it seems that the adware is only installed if you choose to, but I try to steer clear of things that come with adware. Also, d-t has a bunch of code for avoiding game copy protections, I don't really need that and would rather use a product that doesn't have it...
So far MagicISO/MagicDisc seems to fit the bill, comes without spyware, doesn't have anti-protection stuff, and is freeware. Don't see much reason for d-t x64, although that might change if MagicDisc turns out to be buggy when put to more use... don't think so, though.