we have an '08 X3 & it had a trucky ride from the start, especially noticeable for rear seat passengers - we had a used Audi A6 for awhile and the ride was very cushy in comparison - but most of the roads that we travel are fairly smooth and the relatively stiffer ride is a small con compared to the many pluses of the X3 - I realize we're talking X1 but I'm assuming the suspensions of all X models are of similar design & components.
sounds to me like (1) the suspension of the X1 is a dramatic change from what you were driving before (2) you were essentially "off road" driving or (3) the shocks & struts need replacing .
good luck !!!!
Last edited by ubermax; 08-16-2012 at 10:44 AM.