Scp,
So far, I only prefer the Bose approach in mono to all other systems. If I had to use any other brand of speaker, I would not be satisfied with a mono sound, because the Bose treats it very different and more efficiently. Donny's system sounds awesome, and is very versitile, but it takes longer to set up, takes up more space, and doesn;t have the same space age technology that makes the Bose so special.
After you add a mixer, speaker stands, and the 3 pieces of his setup, the Bose is only about $300 more than the Roland/Mackie setup.

Ideally .... I prefer stereo, but i RARELY play in an ideal situation. Mono is a clearcut choice, given the parameters of the rooms I play and the superior coverage that the Bose allows.

More on the Bose in a separate thread today .....