I recently purchased an untested Spring White ERS-210 with an interesting case of DHS. All Aibo ERS-210s (aside from those with the improved supercore clutches) were built with a faulty clutch system on all three head axes and typically all ERS-210s with the faulty clutch system will have full blown DHS by now regardless of whether they have ever been used, but this Aibo had a relatively minor case of DHS with some pitch axis resistance left. This Aibo will still need to be repaired, however, and the condition will worsen with time and the use.