The first company which applied this to guitars is Novax Guitars. They build acoustic as well as electric guitars. Other guitarbuilders are making guitars in this way too, like Marc Beneteau or Michael Greenfield.
Altough it sometimes looks quite strange on pictures, a fanned fret guitar is as easily playable as a ‘normal’ guitar. The guitar will sound bigger, and in very low tunings there is less trouble because of low tension.
Well known guitar players like Don Ross and Andy McKee play regularly on fanned fret guitars.