I'm going to keep saying it but nobody should be using Linode for production use. They have a history of hiding critical issues (in particular security) from their customers. It really is unacceptable and inexcusable conduct.
I currently use Rackspace for anything critical. My experiences have been extremely positive with them. In a few years of using them I've only had one issue where I wasn't happy with them, but in the hosting world that's pretty good. The only reason i'm looking to migrate things is because Rackspace is far more expensive.
If not Linode, which service do you prefer?
I'm still considering Rackspace as an alternative.