Yup, claimed improvements in the new motor aside, there are no 'issues' I can hear with the motor unit in my own 1210. The sound is rock-solid and stable, at all times, with no audible 'cogging effect' (as some have claimed with the 1200/1210), rumble or wow and flutter, in any way whatsoever.
The quality of the motor unit is indeed the main strength of the Technics, so it would interesting to hear what the new motor unit brings to the party, sonically. The other thing with modded Techies, of any description, is the question of synergy [and *genuinely achieving* it]....
With all the various mods available, from mats to bearings and PSUs, etc, from various manufacturers, the best sounding modded Techies will always be those
where genuine synergy has been achieved, in terms not only of bringing the effect of all the mods together, symbiotically, as a musical whole, but crucially also those of the partnering tonearm and cartridge.
I've heard many rather disappointing sounding modded 1200s and 1210s, fitted with upgraded bearings, platters and PSUs, simply because the owner has fitted the wrong tonearm and/or cartridge, whose sonic signature simply doesn't suit that of the T/T itself, or the mods which have been applied to it.
In that respect, it takes both a good pair of ears and a fundamental understanding of what you're trying to achieve, from modding a 1200/1210, to finally arrive at something that's genuinely capable of delivering musical synergy
Marco.