Yes, this purchase system works really well. Incidently the Flysurfer bar is actually made by Core for Flysurfer . The Flysurfer bar you show is similar to the former ESP bar made by Core. The new Sensor bar is considerably lighter and also has the parallel center lines running thru the bar in a perpendicular orientation that makes stradling the centerline with your fingers much more comfortable. Also they've eliminated the narrow diameter mini-fifth line by virtue of the new design that incorporates the centerline safety into the double 5mm dyneema line (much safer and more reliable IMO)
The new Core Sensor bar has essentially the same setup except instead of microblocks with bearing they use the solid ferrule sliders (one just above the cleat and one at the "y") - you may have seen this type of hardware on some recent kites (Best, Cabrinha, Core, and some others). I'd be concerned with the blocks that have bearings in them when in a sandy environment. You might even be better off with the cheaper "bearing-less" micro blocks that Harken or Ronstan has, or get a hold of some of the "ferrules".
The ease of adjustment and control of the depower system is really nice with this setup. In the case of the Core Sensor Bar the centerline/mini fifth line geometry has the split for the front lines about 14' away from the bar.