I have been using Amazon EC2 and Rackspace for a little while now to do testing and just to play around with different things. Now, I want to run a couple of permanent Drupal/Joomla sites and don't want to use a dedicated server at my place due to maintenance issues, etc. Shared hosting is out due to security concerns. I would prefer something like a VPS because of pricing. The question is--how reliable are they? Anybody using Linode or Slicehost and happy about the experience? Slicehost is a little bit more expensive, but they seem to offer a lot of stuff for the money.