I have both the freemaster and a madoline. I prefer the freemaster for potatoes and the madoline for cabbage. If I have a lot to do I will use the slicer/grater on the Kitchen Aid Mixer.
When I have a lot to slice, I use the food processor...funny thing. I have two of 'em (it rained Cuisinarts here a while back). So I usually use the 14 cup, but if I have a lot to slice, think sauerkraut-25# cabbage, I use the 11 cup, because it has one of those chute attachments to replace the workbowl.