InstaFetch sucks in a lot of ways. I bought it on the Kindle Fire and it has a couple huge flaws.

Pagination hides text behind the Fire's little menu bar.

You have to click a button (or wait a minimum of an hour) to sync. The sync process takes minutes.

Not to mention it cost more than Instapaper for iOS.

I agree. I use Instafetch and it covers 100% of what I used on the ios version of Instapaper to the point where I couldn't tell you what other features IP had over IF.