Korg KDM-3 Digital Metronome Black

Really cool metronome. With a variety of voice built in you can really tailor it to your needs. I use it with a classic metronome click and a voice preset. Unfortunately, a built in speaker is of poor quality. I never cranked it up above 75% on volume dial, yet it still got broken. It started with a little buzz coming out of the speaker and ended up distorting everything. Luckily, it a headphone output so I can still use it.

I was surprised by how small the unit was but it's pretty easy to get the hang of it and get used to where the buttons are. It's plenty loud and has lots of modes to ensure the sounds and patterns will suit the vast majority of objectives.
If you want a metronome that is very functional and reliable then this is the ticket. Clearly it's not vying for the consumer that wants the simplicity of a weighted lever or the elegance of a wooden unit. For everyone else though I would look no further.