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.

It also lacks the article length estimate which is really nice when you are trying to find something short to read while you're in line or something.

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.