IMHO the default skin takes too much space and I don't like that much of wasted space on my laptop screen. Why to use so high tabs and so wide border above and below address bar? 2 rows on top of the screen could be almost 2 times smaller and that would be a big benefit. Only good side I see that it now has smart card support but as I have more visible space in chrome then it's questionable I will keep using it.
Unfortunately in years of development Opera has transformed to simple Chrome and lost all the nice features that made it special and better than others - great sidebar, mouse gestures and skins. Tabs were way before IE and Chrome, luckily they kept those and probably only because of everyone started using them :rolleyes: