I absolutely love my 52i. Heating 2 floors of my 2700sf home just fine (thanks to big open floor plan). The oil only sometimes kicks on the top floor when it gets to be <20F at night. I have used ~1/4tank since Jan 10th and I woud have easily expected to use 2+ full tanks by now. ROI is going to be quick on this bad boy thanks to this winter. Doesn't seem to be too picky with pellets. If this unit's fans are much quieter than the previous version, I would hate to hear the old one. I am used to having the fans, but last week it certainly was nice to not have the blower on full blast.
Complaints so far:
Clinking noise of the pellets going down the auger
Scorched glass in the first 2 weeks of using it
That low rumble you sometimes hear
Family members complaining it's too damn hot in your house
I have gone throught my 52i inside and out a lot since I bought it in January. Never used more than a crevice tool.
This is my weekly cleaning kit:
Shop vac + hepa filter and crevice tool
Big canvas drop cloth
Paint brush
Gloves
Stove glass cleaner
I just bought the 52i service kit so that I could clean the liner and see how much dog hair and dust were in the motors. Looked pretty clean back there minus the ash pile that fell out of the liner when I pulled the unit out.