The problem with suspension seat posts is that the sag (inherent in all suspension systems) affects the saddle to pedal dimension. Set it so that the saddle height is correct without a rider and it'll be too low when they sit in the saddle and settle in to the sag. Set the saddle with the riders weight on the saddle and it'll be higher (at rest) than normal, making it harder to get a leg over and to get your arse in the saddle. You have to account for the increased saddle height every time you settle back into the saddle from a standing/honking position. This system, with its pivot close to the bottom bracket maintains saddle to pedal dimension through its travel. Also, crucially, it allows an (effective/virtual) axle path (if that's what we're going to call the movement of the saddle around the pivot in relation to rear wheel bump forces) to be more congruent with rear wheel bump forces. When compared to a suspension seat post. I'm guessing.