I have the DGX modular valves and one of the H adapters but not the crossbar. They are indistinguishable from the Dive Rite modular valves except that they don't say Dive Rite on them. All parts interchange. I would expect the same of the crossbar.
I'm very pleased with them and will buy more. There are a couple of very minor things to be aware of.
1) DGX does not include the yoke conversion "slugs" in the price.
2) You get a 3 piece burst disc which, confusingly, is marked on the plug with a blow pressure of 5250. (Usually only 1-piece assemblies are marked, because of the possibility of the copper disc being assembled with the wrong plug)
3) I had to change a burst disc to a low pressure one and found it quite difficult to get out of the valve.
4) There is no good place to put a wrench on these valves if a situation should arise where they have to be removed from the cylinder with force. There are special tools that thread into the DIN opening that you can purchase from scuba tools places.
5) The profile is relatively short, which I find to be a good thing.