I'm very interested in this myself. Don't have access to the previously supplied link to discussion, but only information I have seen on this stuff was an informational video that of course made it sound like MO99 was a gift from god himself.. In the videos, it was stated that only the schrader valves needed replacing due to the rubber degrading over time,
I'm one guy, and work 15 Subway locations(One more coming soon..yay), all have r22 split systems for cooling, and walk in coolers. If I can save money, and get years more life out of these systems, it would be great. Also, the fewer bottles, virgin and recovery I have to haul around sure makes for a neater van..