There was a recent thread where this idea came up (not sure if it was the same company cuz the website looked different). There were videos of people playing these things and the bends sounded ok. Here's the thread: fanned fret discussion
My problem with this idea is that it would make accurate fretting difficult. Since you want to fret a note right behind the fret, you would have to learn the location of the fret in every position on every string. Either that or you'd have to play while staring at the fretboard so your finger doesn't come down in front of a fret accidentally. Hard to look cool like that!
Plus, would you need a new neck if you change string guages?
Also, every guitar player I have heard, with the exception of those two mpegs from the website, has played straight frets. I think Clapton, Hendrix, Page, SRV, Vai, Satriani, etc. sounded pretty good, don't you?
Seems unnecessary to me.