Well I gave this thing a real workout in the woods tonight and noticed a few things:
1: it's awesome. Tons more traction uphill and I feel a lot more connected to the ground. I can go a lot faster than before with a lot less effort
2: the spring they picked is good
3: I ran out of rebound damping adjustment - it's too fast even when completely screwed in clockwise. I only noticed this on whoops, but I do notice the same thing 2up on road. Not at all a problem on high speed hits which is a little odd.
I'm going to try running more low speed compression and see if that helps, but I have a feeling it might be going back for an adjustment sometime.