Yeti bags were available in Japan, including the Pocket bag, which I presume was the precursor to the Passion 1. A store near me (Sakaiya) stocked them so I got to play with them sometimes. They were very high quality, but rather expensive. Warmth ... you'd suspect that in a 265 gram bag the down filling would be so thin that anything point, like an elbow, would simply poke through and there really wouldn't be much point to the down beneath you.
From memory they used the best Polish down.