IF you transform into Giant Namek and you get stunned as the Growth animation happens, on your screen you'll stay small, but everyone sees you as a giant.
What you get:
You can Dash as what appears to be the Giant Namek Form.
You can Fly
You can Auto Attack from a 35m range (like a Dragon Clan Attack range)
What you don't get:
You can't use any skill possible, neither your specific class skills nor your Giant Namek Skills
I can't get any viable pictures, since you wont believe that a little Namekian Dashing around is actually a Giant in other people's eyes xD
A friend will hopefully send me pictures from his view point, if I get them, I will put them in!