Looks to me like they put the spring in the wrong place (from a design perspective). As that spring is compressed, the angle on the truck will increase (in effect, increasing the wedge under the truck) thus increasing the 'turniness' of the truck. This could be a good thing in a really deep carve, where you want an extra bit of turn (to avoid something...) but when you are dealing with actual obstacles (ie. bumps) or even getting back up on the board after a push (increase the weight on the board), the trucks may get all squirrelly on you...
...at the same time though, springing the rear end of a truck is difficult because of all the torsion generated by the compression of the bushings...
...but springing the rear end would lead to a more stable truck under compression... hmmm...
(and no, I haven't tried them, just my engineering .02 )
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