I need a clip-on tuner primarily for use on my acoustic guitar. I have never had one of these, so I would appreciate some feedback from the forum. There are so many choices out there, and I am not familiar with the pros & cons of different models. Cost is a major issue for me right now. I have seen some great buys on Ebay, but not sure about the quality. I don't want to buy junk, but can't really afford a $40-$70 tuner either.