While Cocoon.IO is a nice service, I'm sorry to say it, but I see very little reason to start using it now. Here is why I think this way:
The only "real" use for iOS is on older devices like iPhone 3GS, iPad 1, iPod Touch 4 (the ones that didn't get over iOS 8) and the fact that you can build the .ipa file without a Mac.
On Android it is useful on <5.0 (before WebView+ is updated separately). That is where the Canvas+ is great (performance and disk space). On Android 5, Canvas+ and WebView+ gives me about the same performance (and WebView+ supports DOM elements and other HTML stuff).
No support for other platforms.
I can understand the monthly fee (they have servers and people to pay) but 500 f***ing $ to remove a logo
Here is small comparison:
You can get GM:S Master Collection for 800$ and export native on pretty much any platform with no monthly fee, anytime you want. During summer sales, you can get it for 500$ ... Heck, I've got the Pro version + Android export + sources from some games for 12$ (Humble Bundle)... But yes, it involves code and very old interface and room/level editor
You can get CF 2.5 (Android and iOS export) for 350$ (or 650$ if you want to include ads/IAP). There was the December sale when you could get it at around 1/3 from the regular price... A decent alternative to C2 If you could get it discounted.
If your game is not that big, you can literally pay someone to port it.
So unless your games is pretty big and hard to port or you are already dependent on Cocoon services, I see no point especially since all the platforms start to have a better support for HTML5 without Cocoon.IO .
Cocoon.IO really have to step up their game for indies, something like to include your game logo inside the Cocoon logo (something like a collage) or % of the ads revenue instead the monthly fee.