I just got the new 2003 catalog, and the D400 is no longer in the lineup. They have replaced it with a new reg called the X650. From the description, it appears to be an upgraded D400. The reg looks kind of like the D400, maybe even a little stranger. Anyone have any inside info on this reg? Anyone have any early scematics? (I don't think ScubaPro has sent me any yet.) I wonder if it will out perform the S600.