For what it's worth I have 11 hours on the new blower. In addition to my 150ft driveway I do 11 others along with 3/4 miles of sidewalk, misc. fire hydrants and storm drains.
The blower has ingested frozen poopsicles, smoked cow hooves (well chewed I might add) 3/4" gravel, one roller blade, a small christmas tree and what looked like a scarf or muffler someone would wear around their neck. In addition to simple snow blowing I also move the city-plowed snowbanks back, you know, that 4-5' high mixture of jagged ice, dirty snow and sand/salt.
The impeller (plastic) leading side edges are scored and very slightly frayed, whereas the impeller housing throat (metal) leading edge is dented and paint chipped. These two edges appear to take the abuse from foreign object ingestion and are in remarkably good shape, all things considered.
On a side note, I sprayed the entire blower and mount as well as the underside of the tractor with Fluid Film before moving any snow with the blower or driving on winter streets. All the accumulated snow and ice and all the other crap slides right off with a blast of hot water. It's great to see and reduces my worry about rusting. In fact, I bought a gallon of the stuff and this spring am planning to spray the entire tractor, painted surfaces, tires and hoses.
Funny observation:
After a few hours of use I sprayed Fluid Film on the drive chain to re-lube it and all the lube put on by the dealership at initial setup flew off during the next use! Wiped right off with a rag.
FF is a very interesting product and appears to have a wide variety of applications. My dogs (herding heritage) go crazy around the stuff, I guess because of the lanolin base.