I have an ancient food mill that still works well, except it tends to get rusty between uses (which is difficult to clean). Same with my old potato ricer. I am planning to get new ones that are stainless steel. I also have an equally old food grinder and have found that to be quite messy, particularly with juicy fruits like tomatoes. I've had best luck clamping it to a table outside and then just hosing it off afterward.
I have had a Foley food mill for years - I have the same complaint as darius. It will leave a dark stain in the center of the food that I have never figured out.
I do have another complaint about the Foley - I find it tiresome. It takes a lot of cranking and it get plugs easily. It also takes a fair amount of pressure to hold it on the container you are grinding the food into. I use it because its all I have and I don't do that much food grinding/processing. But if I have a lot to grind up I wouldn't use it.
The other model you are considering, the Norpro, looks nice. I would gues it would be easier to use complared with the Foley. Keep us posted on your choice and how it works for you.