My hopper size (about 10 gallon of corn), weekly combustion chamber cleanings, daily clinker cleanings, even running the corn through the Sur-Clean I don't mind. I guess the biggest thing I find under built on this stove and many like it is the combustion blower. It's basically a little circulating blower and doesn't have anywhere near enough umph to move any wayward ash outside and any ash that hangs a right instead of a left destroys the motor bushings. Bushings, I guess that's what I'm getting at. that motor should be bigger and have bearings.
My buddy is a wood burning kinda guy and has a US Stove down in his basement. That thing has a blower twice the size of mine and he cleans his chimney once a year.
Oh, and in 5 years he hasn't had to put anything into his stove but wood. Makes it kinda hard to tout the benefits of corn burning to him.

I've got 5 seasons on my current stove and it has been a huge PITA. Stove is a little free standing unit built by Grain Stoves Inc in Ontario, Canada. I've replaced the main combustion blower 4 times, the solid state auger/fan timer twice, and the shear undependableness of it "the stove is out again".
My exhaust piping is only about 5ft and the pipe fills up with fine ash terribly, needing to be vacuumed out every 4 to 6 weeks or it will choke the fire out (we still clean the clinker daily and vac the stove weekly).
I need a recommendation of a replacement that isn't gonna burn all the savings of burning corn on replacement parts and can do a better job of keeping it's own chimney clean.