ok the s6x,, well, over all it can be a handfull as it was designed as a full on competition boat. what this basicaly means is that you will have to be precise and controled when pushing it as it is not forgiving. this is why its not so gud on flat water, and it may give u a few epics if ur new to small boats.
on moving water its Slllooooowwwwwwwwww, pyranha made this boat a little too square and getting speed on wave is problematic.
on the plus side, its built to last and will loop well when in a hole, but again will take a little more practice to get it to perform than some other boats.
all the extras can be used to alter the boats performance. the VHGP or variable hull geometry plate alters the length of the plaining surface of the hull and creates an area of low pressure under the tail, this will slow u on steep waves/holes so as to allow u to go for moves calmly. the only down side is that u realy dont want it to go any slower.
the power pocket enhancers will drive more water pressure onto the deck of the boat helping u to ends down( this will help on flatt) and will also help bow stalls and loops.
the finns help generate speed and direction, although use of them on a river is very difficult as they rip off. (they were designed for competition only) and the green grabbers on the sides will increase the spin rate while wheeling/spinning.
phew......... hope that all helps