I purchase my first Boss vacuum over three year ago . I have not have any problem with it . I purchase my second Boss vacuum because I want a new one . I give the first one to my nephew . both vacuum pick the allergen and other stuff that get embed in the carpet . I have use it on bare floor as well as thick carpet . if you want a quiet vacuum , this be not for you . I want a vacuum that help with the environment . this device do that because it use micro filtration bag and hepa filter . I use the accessory to clean up around area that I can not get the vacuum in . if you need to do stair , I would recommend a hand hold vacuum . if you have the strength to carry this unit up and down stair , it will do the job .