Peter, one thing I've found re speed stability/accuracy in belt drive versus DD/idler/rim, is that in belt drive it can fluctuate over the course of a few seconds due to stylus drag/groove modulation, whereas with many of the non belt drives I've auditioned, and esp. my direct rim drive, there appear to be no/minimal fluctuations over the course of quite a few minutes, but some speed drift day to day, perhaps due to enviromental factors which can be eliminated by adjustment of speed at the start of a listening session.
Still can't find a link to the NVS review.