OK, well, here is my post to add to the "yet another oil thread"...
I use synthetic in all my vehicles after breakin (usually my second oil change). The main plus of synthetic is that it lasts much longer. It probably performs better in other ways (less wear, better stick, better resistance to contamination, etc, etc) but everything is arguable. Most people will agree that synthetic oil absolutely lasts way longer before breakdown.
I typically double the recommended oil change period and ignore the time period or at least double that too. So if the recommendation is (as it is for the Concours) "replace oil every 7,500 miles or 12 months", I will replace every 15,000 and don't care about how long that is. Has served me fine for many, many years.