That's actually completely wrong, 529 plans remain the sole property of the parent who started the account. As per the Eighth Circuit Bankruptcy Appellate Panel decision which found that 529's belong to the settlor. You if want to take the tax hit you can cash out a 529 any time you want and they can be raided in bankruptcy actions for newer contributions. IE you cannot hide cash assets in a bankruptcy by sticking it in a 529 plan. The 529does not become the property of the child until the child reaches the age of majority and the settlor agrees to relinquish it. You have to set up a UGMA/UTMA plan if you want the assets to belong to the minor child. It's important to underst and that UGMA/UTMA contributions are not the same as the 529 plans.
The 529's are a good way to go both in terms of taxes and parental involvment in post-secondary education. If you set up the UGMA/UTMA plans the money is the child's and you cease having a say in the use of those funds. With a 529 you have the option to cash it out if your child isn't going to college, or an acceptable program of study. The downside is 529's are vested in various securities and stocks, thus they can lose value in a down market.