Total elevation gain for the ride was a pretty big 4,500+. Miles was on his game and off the front on each of the big climbs. Here's a graph...

View from the Camp 9 fire station...
The entrance to Viper...
Miles and Alex all smiles as they're about to drop in on their home-court single-track...
Overall, the trail was incredibly flowy and fast with a number of steep sections. The infamous Viper section was quite scary though, at least to me. Alex and Miles both cleaned it nicely. I made it about 1/5 of the way down and then (weakly) stepped off.
Here's a pic of the section taken from the other side. Trust me, it's steep...