They are better for 2 reasons:
1) You can still collect regular fastpasses with your park tickets like you typically would
2) Unlike regular fastpasses, they are immediate. No killing time or returning to the area from across the park later. Put it in the machine, get a fastpass good NOW.
The downside is that you are offered 3 ride tickets from each of 2 groups of rides. They allow one for every member of your party, technically up to six, but perhaps more.
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We did this in March. They are good for you and up to five people in your party. We did ours through City Hall. They needed all four of our tickets and then handed us another ticket type thing that we took to the window where you check in for tours. There we received a strip of tickets for each of us. Each strip had 3 of Daisy's Favs and 3 of Donald's. There is a list of the attractions each can be used for on each ticket.
As mentioned above, you can still collect regular FP's while you have these.
However, as these don't come from the FP machines, there is no need to put your ticket in a machine to get one.