I used a Seymour Duncan Woody when I need to amplify an acoustic--they cost about $40, pop in and out in seconds, and sound pretty good. No doubt there would be a glaring difference between a magnetic soundhole pickup and and some elaborate system of miking, but, given the vagaries of feedback, ambient sound, and the myriad of adjustments that they require, on any given day, this thing is going to give you a much more consistent sound--especially when you're playing with a band.

Our own everliving troubadour, Rick Fielding recommended it to me back when he was still with us, and I have never regretted it. Plus, when I use it, it reminds me of him, so it's doubly blessed--