I’ve had about two weeks to really work with this vacuum, and I am more impressed every day. First, it senses the surface that you’re vacuuming and it also senses the amount of dirt. It needs to suck up. So there are times when it’s not as powerful and times like in a deep carpet situation, it’s really working hard. It’s so lightweight and more quiet than other cordless vacuums. It almost makes you think it’s not working as hard, but I get more dirt and debris up using this vacuum with one swipe than I could with my heavy duty plug-in, vacuum cleaner. I am thrilled with tmore quiet than other cordless vacuums. It almost makes you think it’s not working as hard, but I get more dirt and debris up using this vacuum with one swipe then I could with my heavy duty plug-in, vacuum cleaner. I am thrilled with this product, love the shark brand, and will continue to use this brand specifically in the future because of this unmatched quality.