Ranked in these QuestionsQuestion Ranking
Pro Sharp, flat, and fresh
All icons look pleasing, especially with the Arc theme.
Used on Lubuntu and BunsenLabs, for example.
Pro Active development
Con Under GNU GPL3
This limits the use elsewhere.
Con Contrast issues / No border around icons
It makes the the fast and makes it simple to add more icons(since you can simply scale them) however the contrast is lost in some situations.
Con No Ideas
It just copies the icon-syle from a different system.
Con Just another material style copy
Con Lacks icon for backintime
Backintime tray icon doesn't display on the panel because Papirus lacks the icon.