Overall the device is great, i would definitely recommend it over the cheaper versions that constantly need new batteries!
If i had to point out some flaws, the charging port could have some silicone plug for it but that's really minor issue, no one plays in the rain either way, right?
The other minor issue (because i like tuning my guitar half step down) is that i had to memorize the values in sharps "#", because it doesn't display the flats "b". Otherwise it would be 10/10 !