I love the 3 30" in portrait. Hardly any fish eye effect on the corners, lots more vertical resolution, and less of a feeling of having the picture compressed vertically but stretched horizontally. I tried 3 24" horizontal and hated it for those reasons. 3 30" would be even worse. I tried PLP with a center 30" and 2 20" and loved that, and would prefer to use that, but since neither NVIDIA or AMD support PLP for gaming, I got sick of having to use hacks and SoftTH, and being limited to DX9 games.
Do you find it difficult to see the upper part of the screen? I've been thinking of going portrait with my 3x30" but I'm concerned that I'll have even more trouble keeping track on what's on the screen than I do now with landscape. How far away are your monitors from your chair?