Ed, yeah I might take you (or someone with a porthole viewer) on that offer just to see how they turn out. My main concern is the distance ... For example, my 120g is 26'' deep lol and nothing is right at the surface, z/p's are on racks about 1/2 way down. I think I'm gonna toss it on the ole' credit card and test one of these out - Might be the best thing next to a $600+ purchase.
Dan, let me either way since I would still have to meet up with you since I'm in one of the grow out contests. Also I just measured the Top-Down Porthole and it would will get you about 6 3/4" closer to your Z/Ps. I'll see if I can to take a pic with the Top-Down Porthole and my iPhone to kind of give us an idea of what it would look like through the porthole. Also Dan something to keep in mind when I take these picks is that your tank is 2" taller so....