I have been riding the American Classic Race 29 for a couple of weeks. So far, so good. Set up tubeless super easy. Tubeless rim strip is included as well as the valves (and QRs.) Spin really nicely, too.
If you don't care about engagement AC can't be beat. WTB hubs are the same and cheaper. Light, strong, smooth, convertible, engagement is just terrible (24 points, but engages like less due to the ring drive).
Been riding the i9 all year. So far they have been great.The crest rims have stayed true and the hubs have been trouble free. Im an engagement snob(last wheels before these where hadley and kings) and the i9's are truly amazing. I have no experience with the acs but they look nice too.