I've used this extension, Instapaper's wireless delivery, and Wordcycler (a desktop app that that syncs files from Instapaper when your Kindle is connected to your computer).
This extension is better than Instapaper's wireless delivery because it treats each article as a separate "book". Instapaper, on the other hand, groups all the unread articles in a single book with each article as a different chapter. This means that if you read halfway through one article you can't start another article without losing your place.
The extension also works better for me than Wordcycler because Wordcycler doesn't download the article from Instapaper. In order not to hammer Instapaper's servers, it grabs the URLs when you connect your Kindle, then downloads and formats the articles itself. By the time I connect my Kindle to my computer many of the articles are only available as previews, so Wordcycler doesn't get the full article.
I'm inclined to think that the author is not doing anything malicious, the js code is obscured/minified so it's hard to verify that. I'll say that the analytics script has the sole purpose of tracking real usage (the webstore doesn't provide any info on "active" installs).
Other than this, the author already received a comment pointing out the existence of readability, i hope he'll update his code soon.
Ok, the author confirms with a webstore comment that none of this data come from the users. It looks like they test the extension on various websites and add there manually the text location for sites that are not being parsed correctly...
This extension is better than Instapaper's wireless delivery because it treats each article as a separate "book". Instapaper, on the other hand, groups all the unread articles in a single book with each article as a different chapter. This means that if you read halfway through one article you can't start another article without losing your place.
The extension also works better for me than Wordcycler because Wordcycler doesn't download the article from Instapaper. In order not to hammer Instapaper's servers, it grabs the URLs when you connect your Kindle, then downloads and formats the articles itself. By the time I connect my Kindle to my computer many of the articles are only available as previews, so Wordcycler doesn't get the full article.