According to Esoteric Europe they did a head to head and the combo lost out to the X01D2. Based upon the comments, it is likely that it's superior to the X-03, which isn't that hard (although it's a good unit at the pricepoint). At the end of the day, as long as the box styling of the X-01 D2 doesn't put you off, that would be the one to go for since it's performance is superior and you don't need two AES/EBU cables, a BNC/BNC SPDI/F for clock, an additional PC and an additional rack space. Even worse, once you factor that all in, the combo is probably more expensive than the X-01 D2.