Pros : Works the same as other foil, but more cost-effective.
Cons : If you don't like seeing copper color through the glass, then you need to get the black or silver-backed.
Other Thoughts : I usually leave the solder to patina on it's own; in that case the copper is visible as "not matching", but to my eye adds some variety to the piece. I'm not concerned about the "not matching" (which is usually hardly noticeable), but I know some people are concerned about that (or like to patina with copper wash to match).