Once I just received I opened the box and started to used. The assembled is very, VERY easy, I do not need to check the instructions. I tested it on one carpet that my dog loves to lay down in and seemed to work very well. I love this shark vacuum. My house is 40% carpet and 60% hardwood with throw rugs. The brush does seem to pull a lot of hair and doesn't have to have the roller cleaned and cut out hairballs and such. It is a little hard to push, but if you turn the dial to relieve some of the suction it is much easier. It is quieter than others brands and I really recommend this product to families with dogs or kids with allergies.