I do not like the new "round licked" look at all. I also agree with all the spacing issues discussed above.
What's really annoying since the redesign is the placement of the mute button in the tabs bar.
I have many tabs open and hit in 4/5 times the mute button instead of navigating to the tab.
The placement in the old design was much more intuitive with less precise clicking, especially with a touchpad. Can you have a look at this?
PS: I use Opera as my main browser since 2001.
The tab grouping feature is pretty cool, btw. Thumbs up for that.