For a monthly pass to be worthwhile you have to use it more than two trips every weekday (at least 48 times in a month). If you are taking a week off (as many do during December) it may not be worth it. On the other hand, even if you don’t get the full value, it’s often worth it for the freedom to get off and on whenever you like and the convenience of not worrying about having enough tokens.
— submitted by Darwin O’Connor