Havent used it-we are going to paris in a few weeks so have been researching it. The Paris museum pass seems to be worth it but the Paris Pass which includes a metro pass may end up being overpriced- it may be cheaper to get the paris museum pass and then get a different type of metro pass --either the carnet -which is a booklet of 10 rides or get the passe navigo if you are starting the trip early in the week.
IF you order via internet make sure you are not overpaying...