I like the scrolling tab, it looks really clean (this was the main issue I had with the UI of SublimeText), but there is one small annoyance: if the tab are all "collapsed" on the left, it is easy to quickly scroll by alwasy cliking at the same point. But if they are all collapsed to the right, then the first one i need to click on a small region, and for the second one this now reveals the close button of a tab, and i need to move the mouse to scroll more.
One thing I would like is the ability to scroll the tab using the scrollwheel when the mouse is hovering the tabs (should be pretty easy to add i guess), then it would really be perfect
Edit: I noticed that you can keep the button clicked on the "collapsed" tab and this will make the different scroll. Not as good as a scrollwheel, but at least usable when i want to scroll from right.