I had the chance to personally try out PIU ProX multiplayer system at LIW 08.
The pads are about 10kg each, made of metal and the “sensors” (more likely the the two metal plates) are sealed off which could make this platforms work for a long time. The panels are from different kind of metal than the cover (which is slippery, the panels are not hopefully). The center panel is too big, otherwise the pad would have the real measurements (or could be considered a PIU pad).
The software is mostly PIU Pro with new features. You can select 3 difficulties at once or 1 difficulty. If you select 3 different difficulties and you select easy difficulty it will show easy + the other two that follow (thus normal and hard). Selecting any other higher difficulty will show normal, hard and crazy at once.
The player can choose on what difficulty to play. The computer will recognize what difficulty the player is playing on and will keep counting score for that song. A player can choose in mid-play to switch difficulties. It takes some time for the computer to register the change but it does it. (what the score does is another matter though).
Modifier menu is available.
you can check my PIU ProX video on my youtube account =>
LIADZ2