Excelent for ocasional usage Rated 4 out of 5 stars
This is a pleasant to use add-on if you need to grab screen-shots now and then. While it's true that it could use some polishing (some times the "Selected area" action lags for a few seconds, the zoom pane gets on the way of your selection or the pop-up menu displays partially off-screen), it's nicely designed and works as advertised so I'd recommend it for occasional use. It also has a very good editor to add annotations and highlights or blur parts of the capture.
However, it isn't very practical when you need to capture many screenshots in a row. There's no option to save images automatically in a given directory and copying a selection to clipboard requires 3 mouse clicks (keyboard is not an option).