Since I'm seeing an heavy support from Scirra to AppMobi I would like to put a word of warning to the users.
While AppMobi is a relatively well made environment, the way is being developed could create several problems to a serious developer.
The first deal breaker is the versioning, meaning that you are stuck publishing the version number of AppMobi, apart from a professional point of view (who start with a 3.x release) this actually prevents any form of updating through the appstore; appmobi actually claims the "revolutionary" update throught internet (to sell their cloud services), this apart from being a very bad idea security wise (you application travels on the web and can be sniffed) it's actually in direct violation of the appstore policy. While appmobi claims that Apple allows the downloading of content (which is through) it doesn't pertain this particular case and since Apple is not completely sold on html5 application is a direct ticket to ban.
Another issue is the fact that appmobi is closed source and thus you depend completely on their decision about what to implement (example the lack of gamecenter) and not having direct control over the code your hands are tied.
Personally I'll stick with PhoneGap and heavy optimization, AppMobi is really too restrictive.
If they would sell it as a PhoneGap plugin I would gladly pay for it.
What are your opinions on this matter?