Overall very good, works as advertised. Has some issues with generating thumbnails on some pages, but the 'refresh by visiting page' option is a decent workaround. Took me a while to figure out that I can change the number of rows/columns by right-clicking the tab at the top. I feel like it should ask how many to make the first time the page is opened.

I can set a thumbnail with a file, but not a URL. I'd imagine this would be easy to add. The speed dial plugin I was using before also allowed thumbnails to auto- refresh after X hours/days, this does not appear to.