A quick look at Power Pins by Bigrock Engineering for the acoustic guitar with some sound samples. This product is mainly intended to make string changing easier. I don't usually do product reviews, but I was asked for my thoughts many times after I posted a photo on Facebook showing my guitar with Power Pins installed. I waited a few weeks and a few gigs before posting my findings in this video. I am sure the experience will vary for each player, but I presented some issues that may help a guitarist to decide if this product is a wise purchase .