We opted for the evening race due to work (had the 7th fallen on a weekend, I suspect more people would have done both the morning and the evening races)! Friendly, local race atmosphere and a nice distance for newer runners. One flat loop - a few undulations but no hills, so it's a nice fast course if you want to give it a blast!
The only downside was that it took the lower path rather around the reservoir (there is an upper path alongside the water which offers lovely views), so for a lot of the race, you can't actually see much of the reservoir!
Would do this one again, and would like to do the two races in the same day.