RackSpace Cloud Sites

Well today I was forced to start moving all my sites over to my new hosting provider. Getting things moved quickly has been nice but the fact that an 18 hour failure and finding my current provider had to go back 3 weeks to find a good backup was not. After much turmoil I'm getting most my sites on the cloud. I love the idea of zero downtime and quicker performance. My only fear is success. What happens if I get lots of traffic and my usage eats up lots of cycles. We'll see how this first few months of usage changes my mind on the cloud.