Using Chrome13 on Ubuntu, when I try to use the Drag&Drop Demo, the draggable element jumps to the lower right corner of the mouse cursor.

In the slider demo, rapidly clicking multiple times on the left or right arrow to increase/decrease the value fires a doubleclick event, highlighting most of the text on the site.

In the window demo, the mouse cursor does not change when I hover over the title bar, although the window is draggable.

It's these little details that scare me off. When I use a framework, I want it to take care of everything. If I have to add css classes for the mouse cursor or fix element positioning, I'd just build what I need myself.