I have the Gidget 1 and, like another poster said above, I don't really consider it portable. I have my main sewing machine set up in it. It would be pretty heavy to haul anywhere, though.
I've looked at the Sew Ezi online and that one certainly seems more portable, because it has the wheels and the case, and I think it's plastic, isn't it? The Gidget is wood and metal.