Answer
I tested some (but not all) of the tools. Some I mentioned only for comparison. I tested the encryption tool with some simple tasks, such as taking snapshots of the disks and mounting them on other servers and so on. I did not, however, go into deep detail or really challenge them. As I mentioned in the post, I don't think they'll ever be as effective as keeping everything internal, but they are "good enough" for many application scenarios. There are always going to be problems, however: if people create servers with all ports open in the public internet and "password" as the password for the admin account, no ammount of encryption is going to save their data...
