florence museum pass?

If you become a "Friend of the Uffizi" you get entrance into many museums. For a family, if you are here for a week, it is worth it to me (you also don't need to stand in line or make reservations - you go right to the front with this card).

For 100 euro you can get the card for a family of four in a few minutes - details here:

http://www.amicidegliuffizi.it/en_home.aspx

thanks!

is this the official site for museums? http://www.firenzemusei.it/00_english/servizi/index.html

or this?
http://www.polomuseale.firenze.it/english/

they both say official. i'm confused!