Grace is a Fernandez Revolver Pro Fretless Guitar.  She is strung with very low tension strings but her significant attribute, of course, is that she is fretless.  She also has sustain technology incorporated.  Although fretless playing can be a challenge, it allows for great glissandos providing dramatic sweeps of tone.  Grace is a great blues instrument – a bottle neck guitar without the bottle.  Other than that I pick tunes for Grace depending on their adaptability to fretless glissandos.