I have not tried anything else, but I did extensive reading, and selected the Vibraplane over the Minus K because leveling is easier. The other alternatives were out of my price range at over $10k. I have a manual Vibraplane which you inflate with a hand pump, then level. It takes 5 minutes every few weeks.
You might want to talk to the distributor, Steve Klein at Sounds of Silence.
I think there are two types of vibration devices. One like the Vibraplane and similar devices that shield from outside vibrations, and others like Stillpoints or Nordost Sortkones that drain vibration from the equipment.
i think the Vibraplane does an outstanding job at about the same price as an HRS platform.
Best regards,
Jim Perry