I have owned both the Dyson Animal and the Bissell and found the suction to be equal to the Dyson. It does not lose suction even when it is 3/4 full. I have a smaller Shark unit so I don't think that would be a fair comparison. I also have a Kirby that can suck the chrome off a bumper as long as the bag isn't more than half full. The Eraser has a few feature I like including not clogging, easy empty canister (I haven't had to dig anything thing out) and the brush roller that doesn't get string or hair wrapped around it. I don't know how it does that but that has been a problem with every vacuum I've owned.