I've just gotten my first IWC last week. It's the 2014 Aquatimer Automatic. I got both the bracelet and the rubber strap because I couldn't choose between the two. Although the new IWC "quick-change" system is convenient, I noticed that the connection between the strap/bracelet and the case isn't exactly rock solid. There are some small up-down movements after firmly connected. The wobbling of the strap/bracelet pivots around the lug pin, so it's most noticeable near the bezel which seems to be just shy of a millimeter. This movement is more pronounced on the rubber strap than the bracelet.
Since I've never worn an IWC with the quick-change system before, I wonder if this is normal? or the connection supposes to be rock solid without any movement at all?