Yesterday in the Fast Company Live Fail Whale session [mention on Scoble's blog here], Paul Bucheit of FriendFeed jokingly said that his company's external alerting mechanism was Louis Gray.
I cringed when I read that, as the last people who should be letting you know you have an issue are your visitors or customers. I know that FriendFeed is new and may not have the ops team that Dorion Carroll and Technorati have developed over the years, but it is still critical.
You have done a lot as a company to build a brand. Don't let your internal and external performance sully your reputation. There are a number of low-cost and free ways to watch your performance and alert you before things break.
Louis Gray is a great guy. But he is not an objective and reliable way to alert you when something is wrong with your site.