Exactly! I was going to ask if this extension works better than Safari Reader. For some pages, Safari doesn't enable the Reader button, instead leaving it as the RSS button. For some, Safari Reader doesn't manage to combine multiple pages into one page.

From the developer's web site:

"How does Page One differ from Readability or Safari Reader?

"I'm in love with Readability. I am publicly saying here and now, I want to make out with each and every one of the folks responsible. But it's a different take. Readability strips out the page's design, including its navigation. The goal is to send the site away and leave only the content behind. Page One meanwhile leaves the site design in place (in most cases), letting you see the article's entire content without breaking from the site's browsing experience. You don't have to take any action to trigger Page One's functionality, either. It makes its changes silently so that you're getting full content as part of your casual browsing. Page One and Readability are nice complements, I think."