Well if we look at it this way, Uhaul used them. And I can't see them using something that is prone to failing, especially if it could usually involve pulling heads to remove broken off plugs.
Who says they were using them, remember, this is a closeout sale isn't it, that means they are getting rid of this stuff, clearing out the stuff they aren''t using or can't sell.
I happen to really like Bosch plugs and they're all that I will use in European cars, but I couldn't get a set of the things to last a week in my truck.