I was tired of slow, somewhat inaccurate tuners for day to day playing, plus I want to be able to do my own guitar setups, so I wanted something accurate. Well, as other reviewers have pointed out, in the world of strobe tuners, there's basically this, and the more expensive offerings from Peterson. What sold me on this, despite the other features on the Peterson (sweetened tunings, etc.) was that this can power another pedal, and has the "strum and tune" feature that's very quick and useful. Play all 6 strings at once, and it will tell you which ones (if any) need adjusting. Bonus is that it actually now powers all of my (9v) pedals, which is great. It's quick and easy to use, very accurate, visible night or day (haven't used it outdoors), and it's as accurate as the Peterson, for a good deal less $.