I was able to borrow these wheels for a couple of weeks...thanks for that.

Here's my review, loved the wheels....

RIDER: XC Rider for 25 years. Ride MTB and/or Road 4ish days per week. 6'0", 165lbs. Ride agressively on XC trails, don't seek out drops, not afraid to hit medium trail features.
TEST TERRAIN: 70 Miles in the Sierras, 30 miles on the SF Peninsula
BIKE SETUP: Niner JET9RDO, Racing Ralphs with Stans 26/28PSI

These wheels felt AWESOME! First time ever riding carbon wheels, but WOW. very quick spin up, confidence-inspiring lateral rigidity, the smoothness seemed to increase with high frequency wheel chatter that comes as speed climbs. RAD.

The extra width vs. the Stans 355 rims I ride now made the 29x2.25 Racing Ralphs feel better than the 2.35 Knobby Nicks I ride on my own Stans rims. Flat, wide, seemed like the ideal wheelset, tires included, for the sierras...shocking considering the Racing Ralphs are considerered more for smoother XC tracks than the rocky, ledgy Sierra trails.

Loved the wheels, but I worry a bit about longevity, as the rims were borrowed with a tiny crack in the vertical part of the front rim, the crack did not progress at all during my 100 miles of hammering.