Advantages include:

* You can get really "sexy" sounding chords with two fingers.

* You can play lead runs and have loads of open strings to use for backing

* You can develop quite unique sounds which are impossible to get on a standard tuned guitar (that should generate some comment!)

Disadvantages include:

* Unless you choose an open tuning and stick to it you'll never get the depth of understanding of the fret board that someone who sticks with a single tuning (typically standard) does.

Now stand back and wait for the explosion of pro and con arguments!

I love open tunings, Julie is a big fan of standard, we somtimes have an exchange of views!!

Best regards
John Robinson
http://www.JulieEllison.co.uk