30 year old Fisher Mama Bear

[ptm01]

Convinced my friend to retire his cracked Vermont Castings Wood Stove thanks to the advice here. He is interested in the Fisher Mama Bear stoves. He likes steel over cast iron and he likes the size which makes it easier to load it with wood in the morning. I found a 30 year old Fisher. It has cracks in the fire brick on the sides , but not the bottom. What can go wrong with these stoves? What should you look out for when buying a used one? Can one add on an air intake kit?
Thanks again for the help.
-Peter