I've also been following the HE-400i / HE-560 announcement, and from what I've read I am cautiously optimistic. If they can fix the weight/ergonomics, which it sounds like they are really focusing on, then that is a big step in the right direction. With a single magnet, it's hard to say how this will effect sound quality over two magnets. If it sounds great, kudos to them! Nontheless, It will be interesting to read the comparisons of HE-400i / 560 vs HD 700.