Mine was great for pet hair and I cleaned it every other day. However, most people don't know how much hair can get trapped beyond the brushes. I took it apart once and was surprised how much clogged things up. Apparently this can lead to premature failure. Mine is the pet series as well.
On another note, there is a bit of a mod community for these things.They involve things from improving stock gears and bushings to controlling them with your cell phone.
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