I did a review of the Harmonic Capo on the TGP webzine and have been playing around with it since. Seriously cool idea and one of the least expensive items I have found that allows me to get something "different" out of my guitars. I think that the invention is sheer genius.....because it is so simple and cheap ($34.95). At least for me, the videos by the inventor gave me some ideas for different tunings where I don't have the capo pads on all of the strings, which gives me a fat bottom-end sound that contrasts really nicely with the harmonics I get on the upper strings. I have probably spent more than double my usual time on guitar since getting the capo and I think that I am now more open to looking at unusual concepts......which is a nice break from my usual blues stuff that, admittedly, gets boring after a while. I am including a couple of the YouTube videos that helped me get a better sense of what it can do. I wanted to give the inventor credit for a very simple idea that works!