This was a replacement vacuum cleaner for a previous Z model series – this is a replacement vacuum cleaner for my previous 12 year old Electrolx Z series cleaner, 6 months use I have discovered that this vacuum cleaner continually rolls upside down when moving in sharp turns such as room to room, has plenty of suction, is very quiet and has long cord, but rolls over very easy when turning corners and turns machine off, this is more of a annoyance than anything, VERY QUIET, PLENTY OF SUCTION ROLLS OVER TO EASY WHEN TURNING CORNERS AND SOME HOW MANAGERS TO TURN ITSELF OFF