I will lean towards Scott's statement about Mackie being to the lower end of
the professional gear market. I myself do not like the sound that comes from
Mackie mixers, I have on one gig heard there speaker systems paired with one of
there mixers and it sounded good but not great or (if I where describing higher
end stuff) supper.
I have used a A&H mix wiz as a stage mixer for monitors and it did a good job
as well. I haven't used any of Mackie's larger more featured consoles but would
not be surprised if it was not of the highest quality.