I agree totally with Metheny regarding the sound influencing the way you play.
People who listen to the music for the music and are adventurous in their playing tend to dig it, those who have a narrower perspective don't.
The synth allows me to breathe with woodwind and brass players and opens up phrasing possibilities not possible with standard guitar.
Tone on jazz guitars is a real tough issue.
After a couple years of occasional lessons with Pass I moved to Boston to attend the New England Conservatory.
I love the traditional sound of a guy like Wes or Jim Hall and when I'm playing that type of music I gravitate to that kind of sound.
Still others want a traditional guitar sound if they call you for guitar.
In fact like most other kids in the late 60's I was listening to Hendrix, Allman Bros., Beatles, Eric Clapton and Led Zepplin among other stuff.
The combination of experience and experimentation will ultimately yield a personal sound.