I have used this product before and I am buying it for my father.  This is great for performing live due to the circuit breaker.  You just click the button and you cut out any input from your guitar.  This makes guitar changes fairly painless because there's no huge POP or buzz when you take out the plug.  I would give it 5 stars, but this plug may not fit in all guitars.  I have a bass where this plug will just not fit.  It's a good thing it's not a bass I normally gig.  The connectors feel very good and sturdy.  this is a quality cable that you will have for a while.  Mark it up with your name, or someone will try and steal it at a gig!