Well the good point about the speedlock system is that it is bombproof stable - the only demo binding that is stable IMO.
2. You can move your positiion by 360mm minus your boot length. Makes for a 300mm boot 60mm of adjustment range. I think I have as well already seen a 390mm version. Vist is using the old Nordica??? or another brand technique but have further developped it. Written in older threads here.
There normal not speedlock plates are probabely used by nearly 50% off the racers in the worldcup. (Head, Fischer, Nordica, Blizzard,.....).
Their bindings are not that popular but have a very good reputation.