Firenze card - works to skip the line, right?

I am not an expert on the card but here is my impression:
Depending how many sites you wish to see and what time of year it is: it could range from being overpriced to being invaluable.

You can skip the line and go right up, though think at busy times there may be a separate Priority line for card holders only which may also included handicapped.

Under 18 if you parent has a card you can enter with them ; no charge I believe.

Definitely more flexible. Cost/value is dependent on how many paid sites you will see.

Worth noting ; the Card is not valid for admission into the Duomo which is often the biggest line in town ; as that is free admission the card does nothing. Witnessed many card holders upset about this thinking they did not have to wait in line.
To climb the dome or the bell tower which are in the same area but different lines, the card can be used to skip those lines.

Some sights like Santa Maria Novella have no lines. The Uffizi- you enter with the firenze card in the reservations line. You can just show up with the card and no reservation - but you are still in a line for folks with reservations. Same for Statue of David. A child is added to an adult firenze card at no extra cost. (I believe up to age 17). We did this with our daughter. I don't know how many children can be added to a single pass. Get a RS book and draft an itinerary based on when sites are open and location and attack your plan to get maximum value out of your Firenze card. Here's a couple of tips - activate your card on first day at first site around 10-11 a.m. Then, you can use your card on day four and enter one last attraction before 10 a.m. Another tip is to get the duomo complex pass which is good for two days with the Firenze card. Use the duomo pass for one thing on it on day #3. Then, do the other things on day #4.

I want to correct the above poster whose information is only slightly off target. Entering the Duomo Church is free. However, the baptistery, archeology site in the "basement", the bell tower, and the dome climb are not free. This is where the Firenze card gets you the pass for "free." Also, the duomo has a very nice museum in another building close to the duomo. A famous Donatello statue of Mary Magdalene is here and the original baptistery doors.

At a cost of €72 per adult, the Firenze Card may have you pre-paying for more museums than you have time to see. But when traveling with 6 people, including the ages of 6, 9, 12 and 81, you might find the flexible timing to be valuable.

If you can tell us how many nights/days you have in Florence, we can give you better advice. If you only have 1-2 full days in Florence,the Firenze card will not be your best value and there are other "routes" you can take. For example, if you reserve tickets for the statue of David for the last hour of the day - lines will not be a big issue for most days.

I think Laura hit the nail on the head - our group really requires flexibility, which might make paying a little extra worthwhile. Plus we only need three cards for our party of six. We will be in Florence for 3 full days and 2 partial days.