Setting up a HW19 is not too bad. About the hardest things are the use of the SAMA where it stays put, and of course doesn't touch the Wood Base. As I mentioned earlier, I found 4 of the regular height and regular softness Tenderfeet to be a perfect replacement to set the SAMA upon. The Stock Rubber Feet simply unscrew.
Still, I suppose vibration can pass from SAMA to Turntable Base-etc, because all still might sit on the same Shelf-Stand.
I have seen some make something like A Sand Base-Box, where the SAMA would rest on an isolated portion of the Top Plate of the Sand Base-Box, further isolating it from the rest of the Table.
And about the only one other thing that could be a pain to get just right, was the older VPI Black MK-IV/TNT Platters that had the "3-Point suspension system" that were adjustable, and was extremely easy to get a Platter out of whack with excessive up-down travel/motion.
I had this problem, as I bought my Mk-IV Platter used, and the previous owner retracted all the screws as he no doubt had these issues.
I bought a Dial Indicator, and a Vacuum Base-Stand for it, and was able to accurately zero the Platter. That because before, that up and down motion of the platter and the record could be heard.
To insure I never again lose that precise setting which I had gotten down to +/- .003" play, and for any periodic future Bearing Lubrication, I now always clamp the Platter to the Bearing Shaft with the Spindle Clamp, and pull the entire Platter with the Shaft screwed-secured to it, clean Bearing Well and Shaft, re-install, and I'm good!
As I close, I do believe that these Hurst AC Motors weren't exactly the finest precision Motors made on the planet, and I'd no doubt be correct that there can be a variance of noise, and performance from them. And that too, I'd imagine they do have a life, meaning at some point in time they will not perform as well as new.