I was looking for a small clip-on tuner for mostly home use (recording and practicing guitar). I had previously owned some no-brands cheap tuners (which cost me around 3-5 euros), and they did the job really well, and even worked well for gigging.
However, I was tempted to spend a little extra and try a more expensive one, to see if there were any difference. And with this unit, I am very happy with the extra-euros paid.
First, the construction is quite robust. It has a nice rubber cover, which makes it easy to handle and probably more road-friendly.
Second, and more importantly, the tuner itself is quite fast and precise. I was used for the other tuner bounce a bit, before settling on the note, but this one reaches the final state quite fast and accurate. (At least to my ears, and also to the recording software).
The built-in metronome is just a small heart-beat image without noise (click). I am not using this feature that much, but I believe it may become handy. What is interesting, is that you can "click" on one button of the tuner, and will set the bpm while also displaying it.
A third good point is that the screen is quite clear, even with high environmental light.
Regarding the battery, I can not comment yet, since I got it recently, but I don't think is going to be a good problem.
While cheaper tuner will do also the job, I'll totally recommend if you can spend a few extra bucks for this one.