[chaddeshon]

_escaped_fragment_ is a bit of a hack, but it also provide enormous benefit. It allows you to gain all the benefits this article is talking about (which I won't repeat here) and still make you site crawlable without duplicating code.

You are right about one thing, it is a pain to setup. Much harder than it sounds at first. After doing it a few times, I finally got sick of it and built http://www.BromBone.com. It's a service that takes generates the html snapshots for site owners and keeps them up to date. I hope it will let site owner keep all the positives and eliminate most of the new negatives.