Brian wrote a review of Black Diamond AvaLung II on February 1, 2013
Familiarity: I've used it several times
Brilliant idea and not too expensive. On the other hand, it's not easy to ski with it in your mouth due to 1) airflow resistance 2) tension from the tubing.
Also, mouthpiece feels like it's about 20-30 degrees rotated off axis from my mouth.
I will continue to ski with it (why wouldn't you?), but certainly has room for improvement.