为什么我应该在我的应用程序中使用Zerigo托管DNS？

I'm starting a project using Rails and have bought a domain with Dreamhost. I've already deployed it to Heroku and now just need to take care of the DNS at Dreamhost to point my address to Heroku. Heroku recommends we use Zerigo. Why should I used Zerigo for DNS management rather than doing it manually myself? What are the long-term and short-term pros and cons of using Zerigo?I'm starting a project using Rails and have bou