@Zenguitar: Maybe it is just me but when the master mixer is far away from the stage (which is usually the case) the sound does change a bit (signal loss?). This might be purely percieved difference tho - in that case I think I ran 20+m cables to the mixer. Had better experience having 1 more mixer on the stage...
That wouldn't happen with the XLR direct outs. You could run XLR cables for 60 meters without a problem. If you were running the Amp Outs to a mixer with regular TS cables, then yes definitely you would have signal loss at that length.