The main problem with relying on the boards is that you can't read them on the airplane, in the car, on the bus or in your cabin on the ship when you know you know the answer to some question but you just can't quite remember. For me, it's worth the money.
For those of you who are still running Mom's Taxi, it's a good way to pass the time while you're waiting for football, basketball, gymnastics, piano, etc to be over. I used to get a whole lot of reading and cross stitch done during DD's piano lessons.
P.S. Some of those answers some of us have so quickly....yep, we grab our copy of our Passporter and check it out.