...it just fails to deliver.
Forget their claims that you can display (and therefore tune) all six strings on a guitar simultaneously, it simply doesn't work, and believe me, I've tried it on a few dozen guitars.
For regular tuning, intonation though it's fine, though to be honest I wish I'd bought a Snark or something similar rather than this.
Deeply disappointing, and from me at least, not recommended at this price.