Just have to remember to empty after each use and not let it build up (that would explain the smelly odor). If the dirt builds up it will start getting into every crack and crevice it can find (especially with Dysons). At this stage you'd have to take your vacuum apart more and wash all the plastic bits or get one of those dryer lint trap brushes and run it through there to dislodge the debris.
I have an Eureka Brushroll Clean With SuctionSeal AS3401A and I love it. 3 months use and not had a problem with it (and trust me it's seen tons and tons of dog hair)!
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I think what happened in this era is that with the switch from bagged to binned, people don't realize they have to empty it every use (sometimes 3-4 times per use) rather than a bagged vacuum where you could run a bag maybe a month or more without having to change it.
