Tried using these on a set of Mavic non tubeless wheels to ghetto tubeless the wheelset, but the tire didn't want to air up easily. Used the same stems on a WTB tubeless wheelset and they aired up and sealed just fine. Works great so long as you're not trying to jerry rig a setup.
Well Stan's tubeless just works great, its a new type of skills and nicer that fixing tired in the spring due to broken glass on the road. Stay happy no worry with tubeless tires.