It would seem easier to get a clean note without frets. I don't see how playing with them would make one focus more. Anyone know what the real difference is between fret or no fret? I really haven't given this much thought. I always assumed it was just something different like the tuning keys by the butt instead of the end of the neck or a style like neck size or traditional versus the arrow shape etc.

In between threads I just happened to be reading this article, answers my question pretty well, http://www.bbc.co.uk/dna/h2g2/A711802

and this, http://en.wikipedia.org/wiki/Fretless_guitar

What's coo about the Widipedia is the long list of fretless users which include a good showing of Rock musicians. It does take a bit more learning or skill to play a fretless but it seems the main reason is the difference is sound.