If you don't like the way it looks, read it with Readable App
When you click the Readability bookmarklet, it reloads the page you're reading and styles it according to your Readability settings. Readable App, on the other hand, shows a lightbox-style overlay that you can click out of to show the original page. This is definitely more convenient, especially when you take into account that neither Readable nor Readability works properly on every page. If you hit a page it can't display well, it's faster to click out than to reload. Other than that, the choice between the two comes down to which site's selection of styles you prefer.