I've had this unit for more than 5 years, never fails to perform. Very strong suction. The key to long battery life with this unit is, don't store it in the factory holder/charger. I don't care what they say about battery life, or memory issues, never store a battery operated device where it constantly charges if you want it to last. Charge it when it's dead or dying. I usually get at least 2 months worth of use out of this device between charges, and I have a large hairy dog who sheds constantly. They only drawback is the entry port to the holding chamber, which is narrow enough to clog occasionally, but a skewer stick or screwdriver will take care of that quickly.