I did like my old x1, strong, good airflow, fairly indestructible, but never got on with the auto height, mainly because I didnt have the right carpet to take advantage of.
I took it and a senior 652 to a village hall after we had evas 2nd birthday there and the sebo picked nothing up from the almost lino like carpet, the 652 gobbled everything up and more judging by the state of the bag after (new bag)