From what I've read, its eventually replacing the "Yamaha Ringfree plus" (which is a decarbonizer/cleaner), NOT A FUEL STABILIZER. I've used Ringfree for years in my 4 stroke, Yamaha outboard engine (along with a stablizer) and occassionally in the FZ6.
The Med RX sounds like it does the same but is stronger, works better AND is a fuel STABILIZER.
I normally run a stabilizer and Seafoam (and occasionally Ringfree) in the bike. IMHO, if they make it a stabilizer too, that's one less thing to keep up after.
The regular Ringfree isn't cheap but IMHO, works very,very well...
Quite using ethonol fuel too for the boat (marina fuel much more $) but the ethonol was literally destroying rubber fuel lines.. The additives help keep the ill effects of ethonol at bay..