If you are an avid reader of this site, you should realize by now that I am a fan of Boss effects and pedals of all types. These tried and true products offer solid construction, reliability, and above-average sound.
The Boss TU-2 maintains this high level of performance and has quickly become an industry standard. The TU-2 is designed primarily for the live venue, with its bright 11 point colored strobe lights guiding you to the perfect pitch.
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Found a kid online who put together a nice review of his own for the TU-2:
I've played countless live shows with this pedal and believe me, after even a little use, you will get incredibly fast at operating it between songs. One of the most essential features of the TU-2 is Bypass Tuning mode, which cuts the output signal to your amp allowing for completely silent tuning.
Since the pedal is operated visually, you don't need to hear the notes at all. Your fans will not even realize you are tuning up. The TU-2 also includes more advanced features such as seven different pitch modes for both bass and electric guitar and fully adjustable reference pitches.
All in all, if you have stumbled upon this article because you are thinking of buying the TU-2, have no fears, this one delivers.