As a disabled senior was in much need of a new walker. From what I read everything seemed to me in order. Received my walker very quickly, but there was nothing in the discription that said assembly required. Would have never purchased this model had I know it had to be assembled. Now it will cost more to find someone to do the job. When I've purchased other walkers, pulled it out of the box and ready to go....only had to remove plastic wrapping. Also, somewhat afraid of the plastic wheels. My older walker had hard rubber with some tread....this are slick plastic. Will it be a problem sliding on some of the different floor one encounters in different settings? Question will the breaks hold on this kind of wheel?