What stove did you switch from though? We hear accounts like this all the time but most times the switch is from an old pre epa stove. I agree in some situations switching from a modern non cat to a good cat stove will save you some wood. But not that much.I changed to a cat stove about five years ago. I also bought a new cat from Woodstock a few months ago. First replacement. It was something like $140, perhaps a few bucks less.
Meanwhile, I burn a lot less wood. I fell, cut, split all my own and have for the past 45 years, so I am rather in tune with my supply. By a lot less, I mean I used to burn 4 1/2 cords on a normal winter, now it is more like 2 1/2 cords. Considering the sweat equity and effort, though I enjoy doing it, $75 a year in cat cost is very minor.