I received an O-Port for Christmas. http://www.planetwaves.com/PWOport.Page Installed it on my Fender Kingman and had only 10 minutes with it before having to pack it up. It was immediately louder but did nothing for the tone even thou they are TI Acousticores. The real difference was plugging it in. More clarity and much less feedback. I keep hearing about using tapes on your ABG and will try that next. Very happy with the results.