I had a Sidekick for a short while when they were initially released. I sent it back immediately when I realized that all of my data would be stored on the server, and there was no way to use even rudimentary encryption (SSL) to access it. They actually had the balls to tell me that it was secure, even though it was unencrypted.
And yesterday, there was a story about how they were pentrated by an attacker who had access to their systems for over a year. It was inevitable. I’m not the least bit surprised.