I bought a pair of the 576's from ShoeBuy nine months ago, and they are the most comfortable shoes I've ever owned.  I had injured a big toe and needed a pair of shoes with some extra room, and ended up wearing them every day since then.  I love the more rounded toe end of this shoe, and love the fact that you can order New Balance in extra wide sizes!  Today I ordered two more pair, one in black and one in white, knowing that they will be comfortable and good looking for a long time to come.  After four months of daily wear, I replaced the factory insert with a Dr. Schoell's gel insert because the original had gotten so compressed.