I have a Revo 3 and used to have a Revo 4. Sold the 4, not nearly as much coverage as the 3, and I agree with a poster above...without fog or haze it looks pretty bad. The coverage on the 3 is much better and it lights up a bigger area, and it looks great whether you project it on the floor, back wall, or ceiling. I agree with Synaxis, I have a Tri-phase as my centerpiece, and it works great, so the quad phase is about the same.
Also check out this video comparison I did between the 2