We tried logentries, but their agent was a terrible java-application, that was hard to get working right.

The list of files was saved on their service (rather than in a text-file on the server), and the name of our servers was also guessed by their servers which made it hard for us to add and maintain servers.

I think they should build a better agent that embraces UNIX more, and can be configured through a local configuration. Their platform seems nice, but we weren't able to use it, sadly.