I'm currently going thru this. Picked up a Fox XE that while mechanically pretty decent had been neglected to the point that for me to use it as is was out of the question. head of stock was oil soaked and starting to split, 1 ejector guide pin broken, light surface rust over much of gun. Good was the gun was pretty close to all original other than recoil pad, lever far to right, uncut barrels.
Decided to get a total restoration done and the gun is currently out at one of the top doublegun gunsmith's. In this case I feel a restoration is justified, will be putting a beautiful old gun back in regular use.