They work fine, I have two of them, actually much better that the the less efficient stoves they replaced. More heat per cord of wood and they burn more cleanly, less creosote in the chimney which decreases the risk of burning down the house.
I have one with the catalytic converter, it is nice because the cat is set up so you can cook off it. My concern was how long it would last but it is still working well after 6 or 7 years. The other one is a non catalytic design, there is no set up for cooking but I figured if I would have at least one stove working if I ever had catalyst issues.
Between the two, I’ve burned about 60 cords and both seem to be functioning like new.
I was frustrated because I couldn’t replace my old stoves with non EPA versions but the new stoves are actually a better design.
It is a little weird that once the stoves are warmed up, you can’t tell if a fire is going by looking at the chimney.