Dear Jeremy, You wrote, ....."even dedicated lines (in a perfect world) if you really wanted the Lenco to be at its best"
The major benefit of a dedicated line would be that the noise put back onto the AC line by the Lenco motor would not then enter other components in the chain. This would be perceived as an improvement in the "performance" of the Lenco, when in fact it is addition by subtraction. By the way, this same benefit should accrue from using a power re-generator. So, it does not quite make sense to say on the one hand that power re-generators do no audible good but that using a dedicated line does do audible good. A power regenerator dedicated only to run the Lenco motor would isolate the motor noise from other components. (Maybe his customers were plugging more than one item into their power regenerators.)