Well...
I just saw one of these machines sitting by the dumpster at my mom's old apartment. It looked fairly new, but I didn't pay attention to the filters. I just glanced at it when throwing away some trash and left.
As Durango159 said, these vacuums are indeed easy to replace when they break, due to the low price and Walmart exclusivity.
Earlier this afternoon, I was with Mom at Walmart in Federal Way, WA, and I saw somebody buying a Eureka AirSpeed All Floors vacuum. Those currently sell for $98.96. How can people stand using such horrid machines!?