I see Bunnings have them at $269.for an Oregon Self Sharpening Chainsaw 603354_AAB Norm ,
That makes more sense now that you mention the top edge of the chain gets sharpened as I had wondered how that would work and seeing the chain it makes sense.
Sounds like a good saw, I also see a lot of good reviews online for this saw ,this will put repairers out of business .At $100. it's probably cheaper than hiring a chainsaw for a day.
After I cut up a big gumtree off my brothers driveway with the electric saws he wanted to buy one.