Im a cocoon.io user since from the start.
Pros
1. InApps (RemoveAds & New premium item)
2. Ads (Appodeal & Admob)
3. Share with automatic screenshot of the game
4. 14mb Apk size (My project)
5. GooglePlayGames (Leaderboard & Achievements)
6. Facebook plugin
Cons
1. Not all custom/default plugins and effects are supported by cocon.io (If not supported, it can cause to poor performance, black screen or build error)
2. Going to another layout sometimes causes 3-5seconds or more. Let just say your Main Game Layout has 30-50mb memory image)
3. webgL 2.0 is not supported (causes black screen/build error too) so better use v239 and below version of construct 2