We present two studies using ISO 9241-9 to evaluate target pointing in two different 3D user interfaces. The first study was conducted in a CAVE, and used the standard tapping task to evaluate passive haptic feedback. Passive feedback increased throughput significantly, but not speed or accuracy alone. The second experiment used a fish tank VR system, and compared tapping targets presented at varying heights stereoscopically displayed at or above the surface of a horizontal screen. The results indicate that targets presented closer to the physical display surface are generally easier to hit than those displayed farther away from the screen.