i've got coasterbrakes on bikes without motors that are almost 100 years old (seriously) and they still work great (after a bit of maintenance.)
i've been running a Bendix 76 on a set of Worksman wheels that i got from an old guy who never used them. they're from the 70's.
i was starting to get some weird vibrations and the hub kept loosening up. i thought the axle was stripped and the cones were loosening up, so i took the wheel off to replace it.
first thing i noticed was the hub races were cracked, so i decided to replace the hub with a new shimano.
when i took my sprocket adapter off, the wheel exploded. the hub flange had broken off and the only thing holding it together was the sprocket adapter.
the hub flanges are pressed on on the bendix hubs, but it broke just passed that. it just sheared right off.
kinda scary, considering i've been riding around at 40+ the day i took it apart...
also, i've maintained that hub, greasing it about once a month, so i don't really know why it blew up. coulda been a defect, or it mighta just not been able to handle the constant high speeds.
another weird thing, is the brake would still work and lock up, even with the busted flange.
hopefully, the shimano lasts longer than 6 months...