I tested the instrument with the KORG TM-60 tuner, after I heard this instrument is completely out of tune!
1st problem - The instrument is not in tune.
1st and 2nd octave, most notes are not in tune.
I believe this is a result of wrong holes drilling in size.
2nd problem - creating sound is very poor. I don't want to compare it with my Irish flute, but even for the price this instrument costs, I expected much better. That embouchure is very problematic.
Also, the fingering suggested for the notes is wrong.