My assertion that the majority of meds being sent are legit is based on general feedback from this board and another popular board, discussions with senior members of both boards, my own personal experience as well as conversations with vendors and those close to vendors. Now, we are in complete agreement that there is clearly an issue on the supply side and we can debate the root causes, potential solutions, and ways to mitigate risk, but many of us rely on these medications and don't have the luxury to sit out a few rounds until things clear up.
Now, if there were very few legit meds reaching customers, I'd probably advocate completely avoiding these vendors. Why throw good money after bad, right? But my assessment is that we are not there yet. Therefore, if you depend on these medications to maintain your quality of life, these guys are still your best option, IMHO.