AdWords Express promises to manage your AdWords accounts for you, essentially to do all the thinking for you. According to this article, http://www.searchenginejournal.com/is-adwords-express-hurting-your-small-business/41731/, that could cost you a lot of money. The article contains a link to another post and comments that address the same issues.
AdWords Express manages your whole campaign, from keywords to budget. The plus side is that it’s easy. The minus side is that keywords can be targeted that have little or nothing to do with your business. And each click on those keywords will cost you money.
What should your business do? You can either manage your own campaign – through AdWords or AdWords Express – or hire a professional to do it for you. With a professional, you’ll spend money paying him or her, but you’ll also get a highly optimized campaign, where keyword choices are very relevant to your business.
If you decide you want to do it for yourself, you’ll definitely want to spend time reading up on the process. Make sure you understand how AdWords works and how to manage campaigns. Get an idea of what keywords are important for your business. If you want to try AdWords Express, watch your budget carefully and check to see if appropriate keywords are being targeted. If not, use AdWords and manage your campaign yourself.