The stereoscopic 3D viewing experience has been studied quite intensively recently; however the subjective test methods to assess it have not been determined. It has become clear that the 3D viewing experience cannot easily be described by just one scale. This paper describes a cross-laboratory study employing the same test setup and materials where a multi-scale rating method was used. One of the laboratories used three scales: Depth Naturalness, Visual Comfort and Video Quality; while the other laboratory used these: 3D Realism, Depth Quantity and Video Quality. The results show that the Quality of Experience (QoE) of 3D video is a multidimensional concept and therefore more than one scale is in many cases needed for subjective assessment of the QoE of 3D video.