I have only seen the fanned frets on bass before. One particular high end custom builder used to promote this concept heavily for the 5, 6 and more basses I would give you the name but i am experiencing a brain freeze at the moment.
All the reviews I read indicated the increased scale/tension on the low strings made huge improvements on note definition for the low B string. The reviews also indicated the learing curve was suprising slow.
As for guitar with extensive chord playing
(not just power chords) it certianly would appear to have a little more to get used to.