I know that some flutes do crack for I have bought a few that have. This is because some flute makers do NOT take the time to coat the air chambers as I do. By not coating the air chambers moisture from your breath will soak into the cured wood and cause it to crack. Coating of the air chambers is just one of the many added touches I use while creating my flutes. The entire development process I use ensures that my flutes are among the highest quality you will find anywhere.
Some flutes have a sliding metal reed which are extremely hard for the amateur to adjust properly.
My flutes have been designed with a stationary reed that is hand carved directly into the flute supplemented with an air passage carved into the bottom of the totem. This is another feature that contributes to making my flutes amongst the easiest to play. The beginning flutist is able to immediately achieve quality sound with my flutes. My flutes are designed such that the sound quality tends towards extremely crisp and rather loud even though I have been able to maintain the eerie sound typical of Native American flutes. I can also make flutes that favor a more airy, soft tone if desired.