Just received a Gravity Dropper seat post for Christmas and I love it!!!. Very useful here in Southern California. The ability to go up and down at will has really allowed me to clear things both going up and down that were much more difficult to do before the seat post. Having read many negative reviews about the hydraulic and air sprung posts, leaking, slipping etc. I went with the fully mechanical Gravity Dropper. What I didn’t realize was that you can buy different inner tubes for the seat post that change how much drop you get, 2,3,4,and 5 inches. Each inner tube is $30.00. Mine originally came with 4 inches of drop and I then purchased a 2 inch drop inner tube, better for my use. No leaks, no sticking, rock solid and they will rebuild you post for $15.00. Love it!! I rode for many years without it, but this is one of the few, "advancements" in mountain biking that truly in my mind makes a real difference.