How well do Yakima products play with the Tslot Halo?

I know there are a lot of people waiting for a bed cover with a T slot in it that will mate with a yakima racks

$ Add the SmarT-Slot™ Kit 5 to the TopWater™ box for an even sleeker profile on T-Slot Crossbars This easy hardware kit replaces the standard mounting

yakima tslot accessories Built with the strength to keep heavy loads in place, our steel, T-slot Load Stops integrate with T-slot crossbars or Platform Racks

yakima t slot bolts  comAccessories-and-PartsYakima https user