I really like it, runs well under openSUSE (you have to download the repo and follow the instructions under "Development" in the readme). Hope to see it's functionality expand further.

Edit:

One thing I would change is maybe make the overall border a more noticeable darker color, I keep getting confused as to where the borders are for when resizing it, and maybe a way of dragging and dropping the window (that is more obvious if it is there, I haven't figured out how to move the window without using what I assume to be KDE specific features).