For whatever reason, the AS p0 doesn't seem to get dirty, probably due to the "upside down" orientation vis a vis usual ball heads. The p0 is an enjoyable and very light ball head for light duty. I have not tried mounting my astrophotography equatorial drive plus 400mm lens on it, that is a fair amount of off-axis weight. For that use, I have the Manfrotto 410 gear head. The p0 is an ideal head for mirrorless or for lightweight SLR plus lens (eg, 60D and 15-85mm lens), and is a delight for single-row panorama use, because its pan function is at the clamp end, not at the tripod end of the ball. p0 functions as a leveling base.