The purchase price, although I have long quarreled with me - now I screw but nothing else on my tripod. You notice the high quality of workmanship you start using The ball budge after finding remains exactly in the position where you want them (no "Nachruckeln" as with many cheaper products). Practically also dial the degree of friction - so you can adjust the resistance depending on the severity of the lens. Problem with my Manfrotto tripod was that the ball head is really "screw" could not, in other words: After prolonged use, it was easy. Since I bought the Novoflex Triopod tripod, but this problem is solved - here moves nothing.