Pros : Keeps foil neat, organized, and untangled. No need to constantly untwist foil as when laying foil rolls on the workbench.
Cons : Foil is exposed to oxidation issues.
Other Thoughts : I use several of these, one for copper backed foil, one for silver backed foil and one for black backed foil. Another idea is to keep the entire dispenser in a ziplock bag when not in use for an extended period - helps reduce oxidation.