Very small footprint. Almost you can't notice it in your guitar's headstock. Very well designed.
Fast and responsive
Possibility to use different tuning reference (not only 440)
Works very well for regular scale 6 string guitars, 4 string bass guitars and ukuleles.
The tuner has some problems to track and tune my baritone and 7 string guitars' low B string. Same happens with my 5 strings bass guitar. But eventually tracks it and is able to tune normally and accurately.