DH Bike has Pro’s and Cons
Pros
For qualifying if your top 20 by the time you clear the moonscape you can let rip
Cons
you have to get to the end of the moonscape in the top 20
For the trial bike (160 forked Heckler for me) held my own after the moonscape just fine.
For the race in 2010 I did it on a giant DH as I missed the cut for the main races. Was fun but very hard work on the ups
this year did Mega challenger (2nd) race and was going well on the Heckler bit hard going on some of the steeper sections but handled it all well. Was impressed how well the RP23 did.
Overall
150/160mm bike
sturdy wheelset (+ Spare spokes)
Good Fork
Adjustable seat post
Wide Bars
In it to win it
In front of me on my qualifier was some french dude called Remme Something or other. He was way underbiked on a light weight 140mm commencal thingy with tiny brakes. Never saw what happened to him as he went off like a rocket ship as the tapes went up and set the fastest qualifying time.