If a Vibration plate is truly Sound actuated like the VibraSonic, you will be able to play music through it from an iPod, smartphone or sound frequency software.  Mechanical plates are also quite limited in frequency range, typically for 30-60 Hz.  Whereas the Vibrasonic devices operate from 4-20,000 Hz.
Number of vibrational machines available in the world---about 60 including the VibraSonic.
Number of machines that are a strictly vertical motion--- 3 including the VibraSonic.  Multi-directional plates can create a cellular stress response.  We are aiming for cellular healing, not cellular stress.
Number of machines that function below 30Hz--- 2 including the VibraSonic.  Most medicinal frequencies are below 30 Hz -- earth frequencies, dolphins, mitochondria, healing effects, meditation, creative brain wave patterning etc. are all below 12Hz
Number of machines that are sound actuated--- 2 including the VibraSonic.
Number of machines that emit a coherent low frequency electromagnetic field---2  including the VibraSonic.
Number of machines that have a range from 4-20,000 Hz---1, only the Vibrasonic.
Number of machines that have multiple sound frequency panels --- 1, only the VibraSonic
Number of machines that have ancient tones, Charkras and TBSW frequencies --- 1, only the VibraSonic
There is no vibration machine competition at this level. Most of the other machines are an exercise device at some level, but none have the exercise therapeutics, exercise versatility, and variable sound frequency formulas of the VibraSonic.