Variable height desktop workstation system

A variable height desktop workstation system comprises base 1012, a variable height platform 1014, a lift mechanism (1016, figure 15), and a secondary force assist device 1018 is provided. The lift mechanism is configured to move the variable height platform within a range of motion between a fully lowered position (figure 6B) and a raised position (figure 6A). The lift mechanism comprises a plurality of articulated members (1029, figure 15) and may feature a scissor lift mechanism. The secondary force assist device is configured to provide an additional force to the lift mechanism directed to the variable height platform in an upward direction from the fully lowered position towards the raised position only when the platform is in or near a fully lowered position. The secondary force assist device may comprise an extension spring 1039 and at least one compression spring 1041. A motor driven height adjustable platform and a system comprising user positioning sensors are also disclosed.