Its a great first timers event! I've done the two that have been held so far and will be doing the December one too. I had a great time and have found myself getting more serious about riding in general since the first one.
I had a crack at the Brechfa Enduro too, that was tough but did alright considering i didn't take it that seriously.
These are great events if you want to dabble in abit of racing. Really want to do the UK round of the Avalanche Enduro one year too.
Personally i wouldn't want to do it on a hardtail, i think at least a little travel helps. Rowan Sorrell won the Tech. category on an Orange 5 last year and managed 10th(i think) in the Enduro category! Enduro winner was Rob'Box'Cooksley on a 100mm travel Ram bike.