You will love it Invisible Man. I honestly would go back every year if I could make it fit with other plans, 2013 is unlikely but I will put myself on the reserve list and can make a call on it if I need to.
Like Richie H says, they make everyone feel like an elite really. Make the most of the bottle drop system which is brilliant and you get someone dash out from the aid station point to hand you your personal drink on the run! plus holding out wet sponges etc for you if it is hot.