Absolutely you should. However, read a few other comments about others' films first so you get a feel for what you might receive. Some people have trouble with anything other than praise.

But if you submit with an open mind and a willingless to learn, you should find it a great benefit (I know I do)

Also, please comment on other people's films - it's a two way street. It doesn't matter if you're a noob to making films, you've been watching them all your life so you're pretty expert.

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Tim