Rated 2 out of 5 stars
First of all, it looks hideous. Each time this abomination pops up I wish that TryAgain worked in the latest Firefox beta. Secondly, there's absolutely nothing to configure and aside from reloading every 10 seconds, no additional functionality over the default error page, save that it types the domain name into Google for you. I find myself simply hitting F5 in the end.
EDIT: TryAgain works for Firefox 4! https://addons.mozilla.org/en-US/firefox/addon/2462/reviews/