In short: JUST GREAT! In full: It was my first ever race, I have been running 5KM for past 3 months in the mornings and this was my first race ever. It was brilliant. My position was 7205 and time 1hr and 54 min.
The atmosphere was wonderful, with people cheering etc... Very easy to run past people, etc not too crowded.
Only downside was transportation after the race... Buses and metro has about 2 hr quoues, making me miss my train to London what was a downside, but hey, it was wicked!