Yep - In times when ARC was not invented, memory management took some time to get used to (what with object ownership and such), but you can strike this from the list now. Another thing is that one has to get used to the ObjC way of doing stuff. E.g., Devs who are used to Java will make subclasses instead of categories, add comments instead of expressive method names, and make nil checks where they are not necessary. Or ask where all those open-source projects' unit tests have gone :)