Django forms: reasons to use them?
The more built-in forms, the less work for developers. You are free to implement them from 0 but it is always faster to use something that is already done and tested.
Anyway, you have something in the middle: inherit from built-in forms and customize them.
Are there any real reason to use builtin forms in django?
One of them as I understand is validation. Ok. And maybe some convinience (but not for me).
Anything else? 
Is there any acceleration in site work with forms?