Remember metasearch? Dogpile wants to remind you what meta's about. Its research on the overlap (or lack thereof) of search engine results coupled with rising consumer standards make meta worth adding to your search radar.
I was just reflecting on my choice of "demo" words over my career working in search. What's a demo word, you ask? When demonstrating a search, most of us have picked certain words we use to execute a search and demo our service. Why? Because we've become familiar with the results, it's easy to gauge differences across engines, and using the same term across several engines helps you to understand differences.