I just got the Easton RT's about a month ago but have only ridden them on the road with a tubeless set up. So far very nice in dealing with our destroyed roads of Northern California. I have been very happy using DA 7850's and 6700's tubeless for the last few years and plan on using the RT's the same with Hutchinson tires. Sorry I can't give you more of a report but they look to be a great set of wheels.
Thanks for the info cxchiva, I'm thinking that rather invest in tubulars I could go with these and have a nice tubeless road setup for the off season.
FWIW - Don't have a ton of time on these yet (one race) but I ran them with tubes (they were stock wheels on my bike) and I pinch flatted my rear during the race and I wasn't running stupid-low pressures. I think it just caught a rock the wrong way. I rode half a lap on the flat tire (slowly) and upon inspection the rim held up to the abuse. They seem okay, and are a little wider than my road rims so it gives the tire a bit more 'volume'.