I've ridden these wheels on road and gravel. They roll well and seem to be best suited for wider, tubeless tires (I am using 30mm Schwalbe's). Mounting is easy relative to other tubeless rims.
I have been riding these for two seasons on my Trek Boone. The wheels are super solid and relatively fast, although not as fast as my wife's carbon 303s. I have ridden them with many different tire sizes. My default road tire is a Conti 28 but have tried 25s and they are fine. Many gravel rides using Conti 35s. Cross races on knobby 32s. Have stayed true for the roughly 4,000 miles I have on them. Many rough and gravel roads and no issues. I have not gone tubeless with these wheels because I change tires frequently depending on ride. They easily do a group road ride weekday nights and with tire change are ready for dirt or gravel roads or cross on Sat. When changing tires it helps to really squeeze the far side bead into the center of the wheel when seating the near side bead as it can be tight getting that last few inches over the rim. Also, be sure your spare tubes have a long enough stem.
the first thing you notice when you ride these wheels is how smooth they feel. going up a slight incline is almost like riding the flats. after a descent they just keep spinning. just finished a big charity ride and sometimes I would get dropped by a group on the steeper climbs. no problem. on the next descent I caught them and blew past them ! if you don't think good wheels can make you faster buy these and find out.