I originally owned the freestanding Englander pellet stove with the double auger system with an extended hopper made to carry 80 pounds in my basement and decided I'd get a second stove from them as an insert to heat the upstairs since this first one worked so well. (I could burn it for 48 hours in between refills)Well now I know that was a mistake, this stove would be great if not for 2 seriously flawed design issues, both relating to the hopper. First issue is that this is a single auger stove with an auger tilted at an angle with no vertical drop before the auger (all 45 degrees) so the pellets instead of falling down on top of the auger hold and bunch up on the sides making the stove bring in less and less pellets as the hopper gets lower. Once the hopper is about 50% empty the amount of pellets feeding is noticeably smaller and as a result the flame starts sputtering out so you have to keep opening the lid and pushing the pellets towards the center or else the stove will turn off with about 30% of the pellets still in the hopper. You have to do this 3-5 times each load or else it will go out and turn off which is ridiculous.The other poor design flaw (which makes me wish I saw the stove in person instead of ordering online is that the hopper lid opening is TINY. Compared to the freestanding stove the lid is maybe 25% as deep so when you are filling the hopper with a bag you have to keep putting your hand in there and pushing the pellets towards the back of the stove to make room for the rest. And the hopper does not hold 40 pounds like it says you will never get more then 4/5ths of a 40 pound bag in there and if you are filling it when the stove is hot and having to stop rest the bag on the hot stove while you push the rest of the pellets toward the back of the hopper so you can pour more in as the bag starts giving off wonderful melting smells.Anyways, aside from those two boneheaded design flaws the stove seems to work well.... it annoying that I will have to always be around to make sure the pellets are feeding (and just to note, I have already done the recommended cleaning the hopper, polishing and adding graphite lubricant to make the pellets slide but the sliding issue has nothing to do with the materials surface on the side it has to do with the auger pulling pellets from the sides and having no vertical shaft to drop the pellets on top of the auger. I am almost tempted to pull the stove out and redesign the hopper with sheet metal to make it work properly now. BTW, if any representatives of this company read this. Your hopper lid should stick out to the front of the stove and slope in. There is no reason to have it so small. The extra money for an insert should be more then the same stove with less metal and no pedestal with a reduced hopper lid. DESIGN a real insert please not a chopped up freestanding stove for more money.I'd only recommend this stove if those two issues were fixed. If not this stove is a pain and only worth it if you plan on watching it like a hawk and flipping open that lid and shuffling pellets with your hand every 2-3 hours. Certainly not to be trusted to still be running if you leave the house for more than a few hours.