The fact that they retain your Google searches for 24 hours concerns me.
I don't search for anything that's outright illegal, but due to my rampant curiosity over world issues, technology, politics, etc. there's definitely some odd connections that could be drawn if any of my search criteria was profiled. And that's trusting that this information is true, and that your information isn't secretly stored in some massive server somewhere.
Then again, I do like that Chrome is updated continually, automatically with the little updater and I'm not really a conspiracy nutter so... well, I dunno. Cause for concern I suppose.