Anyone use EVFs for the DSLR?

I have a 5D and a LCDVF. I want to upgrade to a EVF. The Zacuto EVF is of course what everyone talks about and the most highly rated, but theres a cheaper one call "Cineroid EVF" that I hear good things about. I like the universal mounting for them, however I don't like the fact that on the 5D the screen res bumps down to 480 4x3. I'm not complete sold on the idea but highly considering.