Cocos2d for iPhone vs. Cocos2d-x [closed]

Question

I have worked some with Cocos2d for iPhone and find it delightful. I am starting another project, and have stumbled across Cocos2d-x, a C++ port. I'm tempted by the notion of being able to (with consideration) build for multiple platforms at once. I'm equally comfortable with Obj-C and C++, and am not looking for comparisons between the two languages unless it's specifically related to working with Cocos2d.

Has anyone worked with both versions of the engine, and can you comment on specific pros and cons of the two? Is Cocos2d-x "finished"? Reliable?