They do not contain fillers. I didn't have much luck with them but I only tried them on my spoiler and trunk lid for about 30 minutes. I found the glaze to be a nice product. I wouldn't trade my Menzerna for them just yet... I did get less dusting with the XMT line, however, and they wash clean out of the pads with little to no effort, especially with the XMT pad cleaner spray.
I like the glaze, pad cleaner and pad conditioner a lot.