Have been using it for a day.
New default 'Home' icon reminds me of South Park (which I loath) for some reason.
Drop-down history in address bar for typing ahead I find stupid and pointless - it means you have to read *much* more crud before being able to spot the URL you were after.
Extra screen space seems to me mainly due to change of default configuration (it now feels similar to FF2 with small icons and crap turned off).
Still, nice small download, and being open-source means I can fix any issues if they bug me enough.
To be honest, doesn't really seem different enough to warrant a full version jump, but it will remain my preferrred browser (still streets ahead of IE).