Hope this helps give people a general idea of things at the moment...
I've been building with cocoonjs compiler, with WebGL turned off, and my apps are generally working well on both Android and iOS.
The games I'm working on at the moment don't work on 1.4 with WebGL turned on, they work fine with it turned off (50fps+ on Android, but framerate is still not great on iOS, 20-40fps).
My games include sound and music, and there are still some bugs related to sound, but sound does work better than it did in 1.3. Biggest issue I've had is that including a music file creates a long hang on Android v2.x. And if I go to home, then back to the app, music double plays and cannot be stopped, even if I've muted the music file.
That's not a problem on iOS, but my iOS apps do seem to hang for a few seconds when the first layout initially draws.
Ludei released v1.4.1 yesterday. I built on cloud compile today and didn't see any fixes of the bugs that I've experienced.
The CocoonJS 1.4 iOS Launcher seems broken, with WebGL on or off, it does not work (for my apps anyway, and some are quiet simple). I removed it and re-installed 1.3 (I backed up the ipa).
It's frustrating for us Construct developers, but I'm sure they'll get there soon. Without CocoonJS I think many of us wouldn't be even close to building decent quality cross-platform mobile games.
Kudos to them, and keep up the good work Ludei!