Upon first use I had to disassemble and clean. The roller showed immediate wear next to the belt gear. Dog hair accumulated next to the roller gears and in about 20% of the suction base just behind the roller. Getting a burnt smell due to the roller hair accumulation next to the gear treads on the roller. It actually started melting the area. The good part is that I only have to take it apart and clean it every other use, which is better than my shark.