Feature:
This tuner really has just about everything you could want on it, chromatic, 4 semitones to step down to, adjustable calibration if the cent meter is off, 6 common tunings for quick selection, automatic and manual, it's all pretty much there. The mic pics up fairly well and is just about as accurate as when you plug a line in to it.

Quality:
It feels decent, plastic body. I'd be nervous if my big butt every stepped on it though, I think it'd be toast. The stand for it doesn't really put it at the best angle and it is a little hard to read outside. But the backlight is available to turn on or off.

Value:
I'd easily plop down $50 bucks for this tuner any day. Compared to $20 bucks for the cheaper basic Korg, I'd say it's well worth the money. Comes with a nifty case.

Desirability:
I have it, but had wanted it for awhile. I had my hopes up when it arrived and wasn't let down.

Sound:
Unless you are tuning using the sound feature, there really isn't much sound to it, which is a good thing, doesn't produce a hum when you have your guitar connected to your amp through it.

Ease of Use:
The Korg Gt-120 does just about everything but twist the tuner heads for you. It's a tuner...not too much to any of them really.

Support:
Never had to use it, but its a Korg, so I'm sure it'd be a fast response if I needed it.

Overall:
Just get it...you know you want to.

Feature:
Great tuner, but no option to mute sound when tuning live. Deal breaker for me.