With the few tests that I have been able to do using Cocoonjs, I have gotten some really good results, but I have also gotten 'no touch' issues (as others have reported). I was able to get 'touch -> is touching object' to work just fine (ie on screen controls) but I cannot get 'touch -> is in touch' to work (ie touch anywhere on the screen, etc). I have setup that works great with an HTML5 export, so I know it is something to do with cocoonjs.
Besides that, the success I have had so far is very encouraging, and I cannot wait for these issues to be ironed out. Construct2 and Cocoon FTW! :)