MM,
My main point was to think about what you want to turn, then look for the best match for the job as well as your available space. If you only want to turn pens, a PM is way overkill. :cool2:
Once you understand what you want to do, and know any limitations you may have, the nlook/try the options out there.
The PM, DVR, Robust and Jets (and others) are all fine machines, with Pros & Cons for each.
I agree with your other points. Unfortunately, I have no room for a dedicated, free-standing lathe. My only option was to bolt the lathe to a 400lb. multi-purpose workbench. I have tried to add as much mass as possible to the workbench, but there are time when I can get some vibrations at low speeds (under 1000RPM) with pieces of wood that are round, thin (under .25" thick) but have different densities from side to side. When I turn on the PM, I can get to 1000 RPM with no issues. I understand the cause of the vibration there is just nothing I can do about it - I have no more room for lead, sand or anything else. (I generally use the '6000 < (dia. x RPM) < 9000' rule of thumb for nicely balanced pieces.)
I do keep my tools sharp, and re-sharpen as soon as I either feel the cut change, or see tear-out starting to happen. I agree that sharp tools, good technique and understanding feed & speed are more important than just the rotational speed. (While I do use the 80-grit gouge once in a while, typically I can start sanding at either 180 or 220.)
Cheers,