Hi Adam. I'm using the dev. build which updates itself all the time. Every day I think.
I've had no problems with it at all in terms of freezes etc. I like the fact that if the site you're on crashes you don't crash the whole browser.
So I'm on 5.0.356.2dev. (I just had to look). I'm using speed dial, adthwart, gmail notifier and google talk, google wave notifier, fast youtube search, google similar pages, shareaholic, cooliris and chromepad.
It was these addons, especially speed dial, that dragged me away from my first love, Firefox.
If I press ctrl+b the bookmark bar goes away. If I press it again it comes back and stays there.
Basically I hated this browser and only used it for Wave, but it has seduced me and I wouldn't go back now.
Cheers, John