I give this vacuum a nine because it works well every time. It is versatile and keeps my entire home clean and healthy. I can use it with out asking for help. I have already saved more money then I spent on the machine by never running to purchase bags. It's a great vacuum. Maneuverability This machine works well on bare floors or shag rugs. I have both and it always does a good job. It does not lie flat but there are many attachments and the hose allows me reach every where I need to. It has a wide mouth and covers large areas of carpet quickly. It glides easily and does not feel heavy. Ease of Maintenance Love this machine! I never have to run to buy bags any more. The clear plastic canister fills with refuse and I can see exactly how much dirt has been collected. Then I can pop the canister off from the machine with one finger. The canister has a great built in solid handle so emptying the unit is fast and simple. I can wipe out the canister with a Lysol wipe if I want. The machine has two built in filters that can be removed quickly and washed in the sink. No soaps or chemicals are required. When the filters are dry they are put back into the unit and cleaning can begin again. My son sucked up a pencil and some gyp-rock. It clogged the machine. I called the number on the back of it and a very nice woman answered the phone. She walked me through the simple home repair. It was perfect, easy and fast. I love the vacuum and the company. Suction Performance The Dirt Devil Cyclonic action vacuums are great. they never fail. The hose has many attachments and power seems to increase not decrease when being used. I don't have to pass over the same area again and again, as it does a great job the first time around. Versatility The hose offers many options. There is a pointy nose appliance that makes the suction increase and gets into all nooks and crannies. Base boards at carpet level are always full of dust but this nose picks it right up. There is another appliance for cleaning couches and mattresses, or hard to reach carpeted areas where large furniture may be in the way. There is another small appliance brush that works hand in hand with the nose attachment. It goes onto the very end of the hose attachment and now you have a powerful gently brush. I use this for cleaning lamp shades, curtains and furniture with delicate fabrics. Design For me, the design works well. All my attachments are easy to get to. They don't continue to fall off when I am cleaning. It is not too heavy. The cord is long enough. The canister pops on and off easily and has a large capacity for debris. It appears to be solidly built with thick plastics. Durability I have had my machine for a little over a year now and I have not been able to break it. The fan belt has never slipped off. The motor has never over heated. The parts have never cracked or chipped. It works well every time I need it. Never having to buy bags has saved me money from the first day I got it.