Hi Peter: the experiment was not mine, but reported by someone else on the Hi Fi World forum, and I am guessing the mass was nowhere near that of a Giant Lenco. This report is merely corroboration for what I have already heard: a LARGE improvement in every way with the extra added mass. A "small" (40-pound) Lenco was already unthinkably good, easily crushing a VPI TNT MKII for instance, and in musical terms pretty well everything else in the world (barring other large idler-wheel drives), and in terms of noise too. A Giant at 70 pounds is much better (beyond any known limits so far, but then, so was the 40-pounder ;-)), and I am working on a true Giant, at roughly 100 pounds, to enable me to mount three tonearms at a time: I got it bad!!! I have no idea what the extra 30 pounds or so will gain me sonically (diminishing returns?), I'm building it to accomodate my Maplenoll tonearm as well as two others. I have a G88 to work with for which I will cannibalize the parts from an L78 or L75 (newer motors are better, and metal idlerwheel and carrier arm). When this Beast is ready I will report on whether improvements are even audible!! This extra mass is only truly effective/audible when combined with Direct Coupling.