I recently clay-barred my 01 black metallic X using Meguiars Quik Clay kit. Then waxed him with their 'Yellow Wax'. The finish is superb from the clay bar, it was so easy too. And the wax just adds to the amzing finish.
The clay bar process took about 2 hours, the wax about an hour. No grief, no hand/arm or backache! Wish I'd found these products years ago!
Post #12 are the pics I put up on another thread..
http://www.xoutpost.com/bmw-sav-foru...ng-good-2.html
Hope this helps