Not only will you be bound by the terms of the agreement as the last poster said, but you will still be at the mercy of the creditors. Most people don't realize the debt settlement companies can't force all of your creditors to participate.
If one creditor decides not to participate and seeks a judgment, you can be in real trouble. If one creditor doesn't participate and then garnishes you, you're done. You won't have payments to make to the program and all of the payments you made will be, in essence, flushed down the toilet.
Check
http://www.bankruptcyhelponline.org/...-legal-action/, an interesting article that exposes these facts in more detail.