With the GO, you can adjust the individual complications, such as the date, without impacting the others. I believe the IWC works differently with the complications being synched together. It can be a nuisance if you make a mistake, such as advancing it too far. I am not sure how problematic that would be, but maybe others more knowlegeable about the IWC would chime in. This message has been edited by Dr No on 2011-01-31 11:25:38