My experience was pretty similar. Except as mentioned in one of my other responses I had a pretty strong personality change for the first week - probably similar to the robot idea. It went away pretty quickly though. I honestly think I was just so shocked I could think in quiet that I spent more time doing that than I used to, so people thought I turned more robotic. I was genuinely fascinated at how much my internal environment changed, and I did spend a lot of time thinking about it. For me it was so profound and so beneficial that I didn't really care if I turned into a robot, I was staying as long as I could. It turned out to be a non-issue for me though.
