Whats the purpose of this thread... trolling the forum to bash DX or to troubleshoot what you have?
If you are trolling for jeers targeting DX that technically belongs in the marketplace Cheers/Jeers forum, although it will probably slide for a while like other DX bash threads.
Thus far I have bought 4 DX modules and they all have worked fine.
Make sure your cells are fresh or fully charged.
You should be aware that on the 6P you are supposed to remove the large spring, just pull it off, and slide the module into the light. The Brass pill can be tightened / loosened to adjust for tolerance stack ups with the Surefire light host. Just screw/unscrew it slightly to alleviate bezel gap with the body so th epill direct contact the body tube. Try that... hopefully it will alleviate any contact resistance that could be causing the low output. I am not sure about the G2 however.
Just use their RMA/replacement feature and open a "Customer Service Express" ticket. Take pics of the defective module and follow the procedure outlines by the SC rep. In my case it required shipment to their RMA center in Miami. USE USPS WITH CONFIRMATION NUMBER, and DX will send you a new one upon receipt.
They sent me a wrong item once and got it turned around in ~20 days.