In short: Hot.
In full: Previous reports of poor organization seem to have been addressed. Plenty of water stations, good finish area and lots of kind support. My only slight gripe was the walk to the shuttle busses. But that in no way spoiled my first marathon. A hot day made me hit the wall at 18, the wall was thick it lasted to 23. But thanks to all the locals with their jelly babies I got to the end I am now a marathoner, planning my next one and walking backwards down stairs.