I am using it for basses and acoustic guitar. Works perfectly down to low B on bass, on lower sound (drop A) losing sensivity. I have no experience with clip-ons, but I know that many cable tuners have that problem too. I have checked it with Axe FX III tuner, it is very precise and exact. For me it is decent device.
Pro’s:
-exact and precise
-small
Con’s:
-none
It would be good if there would be dedicated box/case as there is risk of damage if it is carried loose in guitar case or bag.