It's great because it's super small and stays hidden on the headstock. Coloured display is nice. Works great on 8 string electric, classical and bass. Very discreet and precise. I don't really use for its visual metronome. Also the battery seems to last for an eternity, I have mine for more than a year and still didn't need to replace it.
This tuner is inexpensive and discreet, hardly visible when viewing the headstock from the front. Quick and easy to use. However, no too good on the low A and E strings, especially in a noisy environment.