You don't need the prime31 stuff, it just makes life a lot easier. It includes a lot of objectiveC stuff that you would otherwise have to write yourself. It just saves you time ( which for some companies is also money ).
If you do anything with unity the only asset store purchase I recommend you must buy is NGUI. It is 1000x easier to use for UI work in unity then anything else out there including the built in garbage.
If you do anything with unity the only asset store purchase I recommend you must buy is NGUI. It is 1000x easier to use for UI work in unity then anything else out there including the built in garbage.