This is my favorite purchase ever I think! My Shollie has an undercoat that mats in spring and fall every year, the only way to avoid hairballs blowing all over the floor is to shave her belly and butt, which is difficult because her fur is fluffy and moves around the shaver. The vaccum feature on this pulls the fluffy fur into the path of the shaver on this, which leads to less passes, and less pulling. Usually my dog is whining and trying to get away after just 2 swipes with a shaver, I got her half done before she needed a break with this vaccum shaver (which is about how long it took to fill the canister so it's perfect!)
I bought this to help with the fur from our dogs. My old dog loved the brush feature and happily sat still for it. So much fur came off him. I also was really surprised with the clipper feature that did a great job with the pads of his feet. If you have multiple dogs, this is worth the cost.