A device for carrying a user, the device comprising: a) a platform (12) supporting a load including the user, b) a module ground contact mounted to the platform, including at least one member (20, 44) of contact with the ground and defining a fore-aft plane; c) an arrangement (51, 531, 532, 541, 542) coupled to the motorized drive module ground contact; constituting the drive arrangement, the module ground contact load and a system that is unstable with respect to tipping when the motorized drive is not enabled; the motorized drive arrangement, when activated, produces a balanced system operation automatically in an operating position that is unstable with respect to tipping in at least one anteroposterior plane when the motorized drive arrangement is not activated; d) a user input control that receives a user indicaciondel a specified pitch of the device under conditions of motion at uniform velocity.