I've owned another model of the Korg tuner, gave it away, and now have this handy tuner/metronome. It's a great tool to have, particularly if you plug it into a chain that has a mute switch contained in it. And, of course it has that metronome built in, in case you don't have perfect mental tempo ticking. I tend to speed things up a bit, so this prevents the "runaway train" during rehearsal. Great price and fast shipping as always from Shoreline.
This is a great little piece of equipment. Very handy to keep around and practice with since it has a metronome built in. I love that the metronome has a tap temp, which is super handy to tap a beat in and then make sure you're on beat the entire time. The Korg Beat Boy has a little drum machine built in as well, which is kind of cool. Personally, I find myself gravitating towards Snark tuners for their simplicity and the fact that I can tune with them in a loud room. I also use a TC Polytune 2 when I'm on stage. But if you want something simple with a metronome built it, this isn't a bad choice.