The item titles lack padding so it all looks a bit clumsy.

The gray in the top bar is way too light compared to the source-bars. The source titles are stripped off so I can't see the full title of my source altho it's only 20 characters.

and when you click on an item the 'option' bar in the bottom right corner you get with aA, share options etc. looks cramped in the little tab as well.

No, definitely -not- well designed imho.