OK. It does do everything it claims, and it’s pretty unique- not hard to do, but not overpowered. While you can do this with heavier programs like Photoshop, it’s not the same.
That said I might be able to do a full review but probably not- I’m busy today (-:
Here’s a video I took when I was planning to review this:
Click here to play 
I’ll update this if I can review it.
The radius is the circular corners. The Stroke Width is the width of an invisible line. It is visible when you change certain settings (20 seconds into the video is an example). A small note: changing the text comments wasn’t readily apparent. It turns out you double-click the text. The text, not the selection.
All in all, I’d say it’s a 8 or 9, and a thumbs up.