well, i can only tell you that i had accuracy problems with the earlier versions of the MM sensor. now the new guardian seems to be accurate, about as accurate as a dexcom.
i cannot tell you any numbers, but many bloggers who had the possibility to try it out report results where the fingerstick and the number showed on the pump basically match almost to the point.
thats all i can say, and for me it is a massive improvement. example:
from Brent Salzmann in Australia
i will have the possibility to try it out very soon, so look for updates on this thread: