Advantages: Economical, Easy to use, Great for beginners, Comes with batteries! Input and output sockets.
Disadvantages: Won't tune cheap acoustics properly.

...I bought this item for £15 from a specialist guitar shop and I have to say it was well worth every penny! I have an electric guitar, one of which was terribly out of tune. It corrected the tuning perfectly and now my guitar doesn't sound in pain every time I play it. This tuner can be used on acoustic guitars, as well as electric ones, also for bass guitars, but I do not own a bass so I don't know how it performs in that area. Electric guitars can be plugged into the side of the tuner for more precise tuning. It does have a built-in microphone, so connecting it to your guitar isn't completely necessary. Due to the microphone, this allows acoustic guitars to be tuned as well. It has a very simple interface, and as a beginner to the world of guitars, I found it extremely easy to operate. It has a digital display (two AAA batteries... Read review

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Advantages: Reliable, Sturdy, Easy to Use, Effective
Disadvantages: None.

...Every gigging musician needs to own one of these. I work as a sound engineer in various venues, and I can immediately guage the quality of a band on whether or not they have TU2's (or similair pedal tuners). The Boss TU2 provides a quick, reliable tuning solution for guitarists and bassists everywhere, at a very affordable price. There is nothing more annoying than out of tune guitars, musicians tuning by ear mid-set, or people sharing guitar tuners (causing long tuning breaks). Simply step on this pedal, tune up silently, step on it again and you're ready to play. Battery life is long, and despite not being true bypass, the pedal is more than suitable for live playing. The display is long enough to provide accurate tuning, and is very easy to see/read on dark stages due to the lit up red/green/red lights indicating flat... Read review

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Advantages: ease of use,accuracy,build quality
Disadvantages: battery life

...more accurate than some rack mount tuners i have used in the past. This pedal also doubles up as a power supply for your other 9v effect pedals. If you are running then off the mains all you do is run your mains power to the tu20 and then link all the others to that. The only downside to this pedal is battery life. It does tend to go through them at a rate of knots. Overall if you are in the market for a good quality tuner with all the features you will ever need then look no further. This baby does it all.... Read review

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Advantages: Very easy to use, very accurate.
Disadvantages: Quite small, loud noises can interfere with tuning with built in mic.

...This is a must for any musician on the move, or simply someone who needs to tune guitars often. The whole thing is incredibly easy to use, with three clear lights that light up according to the note. To use it, you can either use the built in microphone, and it will pick up the sounds very easily, but can be troublesome if there is too much background noise, things like a tv, even other guitars playing in the background can be fine, but there are times when it becomes difficult. The other way is to simply use your musical cable (same type you use for an amplifier) and plug it into the jack socket in the side of the tuner. It will then pick up anything you play. The small dial alternates between the right and left sides, making it very clear how far you are from hitting the right note. The red lights will turn off and the middle... Read review

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Advantages: Lots of rivals, Customization
Disadvantages: Not enough road, Online, Repetitive, Tedious, Sound

...... Read review

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Advantages: Twin tuner flexibility. Good tech support with upgrades etc from toppy.org.uk forum
Disadvantages: A lot to learn, not helped by p***-poor manual

...April 2008 - Two years down the line, I remain convinced that, foibles excepted, the Topfield 5800 remains the clear leader in its field, so much so that I've bought second one before they stop making them in favour of the new 5810T. *************************************************************** I'd owned a PVR before; the excellent Humax 8000PVRT, designed solely for Freeview digital terrestrial TV, but since buying it, two things happened. a) I got fed up with paying £19.50/month to Sky, just for a load of dross intermingled with the free channels I can get elsewhere and b) My TV started to become very troublesome, and any replacement I was to buy was likely to be a flat screen monitor requiring outboard tuners. The Humax's single tuner for Free