Absolutely. If you really learn the material in the decks well, you're almost guaranteed to pass. But it's hard to cram it all in your head at once and remember everything.
I took the boards this morning and I studied mainly from the decks. We'll see if I pass! But if I didn't pass, it's my fault for not learning the decks better, not the deck's fault for not having the material.
If I could add just one resource to the mix, it would be the ASDA released old board questions. You can pay a lot of money for them on ASDA.net, buy them used, or see if your library has them. Some people on the boards say they've found digital copies of them, but you're not supposed to ask for copyright material on SDN.