And unless you're on a low-carb diet, if you use margarine it's virtually guilt-free!
I'm planning parm cheese and garlic salt :)
Now, to find a movie to rent to go with it ;)
The argument for eating margarine and other products containing hydrogenated oils are their lack of cholesterol. Margarine is also less expensive than butter.
However, margarine contains refined, artificially saturated vegetable oil. It also contains harmful trans-fatty acids, and often residues of the toxic metals nickel and cadmium. Butter is a natural food and a good source of important fat-soluble vitamins.
You will pay more for butter, but nutritionally it is well worth it.
Obviously I got this from a Googled site, but still, I would not touch margarine, and I actually have not in probably 30 years now.