InfoClick was reviewed recently on Macworld and named a Macworld Gem. The review, titled “InfoClick review: Find what you’re looking for in Apple Mail” Dan Miller calls InfoClick “… essentially a supercharged search tool for Mail” and in his conclusion says “… if you find yourself constantly searching for (and not finding) messages in Mail, InfoClick could make your life a lot easier.”
You can read the entire review at the Macworld site.