It costs next to nothing, does what it's intended to, and does it well. What else is left to want?
The unit is small, with a nice, big, easily readable display. The display is normally bluish grey, and turns to pleasant green when your string is in tune. A little bit hard to read in strong, direct sunlight, but you can still tune our instrument even then. The display has a matte finish, which greatly reduces glare from light sources.
The display pans around 360 degrees, and tilts, depending on pan position, from 90 to almost 180 degrees. It easily stays in position. The clip is sturdy, and clips on with enough force to keep the unit on the instrument, unless, of course, you go really crazy with it. Under normal playing circumstances, there's no problem with the unit holding onto the instrument.
This unit is designed for a ukulele. There are two standard tuning sets, C-tuning and D-tuning, plus a normal chromatic tuner. Tuning a ukulele is easy with this tuner.
I also tried tuning a nylon-stringed guitar, and it works perfectly with it. I even tuned an electric fretless five-string bass with it, but I had to use harmonics (flageolets) on the low B string. Nevertheless, it tuned even the electric bass.
It's cheap and it works. Buy it!