The upper half of the 2nd octave is noticeably sharp, around 30 cents or so, and trying to blow it softer makes it drop back into the 1st octave. Furthermore, the ooo ooo (all holes open) is too sharp in my whistle. All in all, it's a fine enough whistle that sounds good and is easy to play but I have to drop one star because of the flaws in the intonation.