I just went back and looked at their application to figure out how we realized they were good. Their answers were very clear and concise; they obviously understood their users well. Plus they had both done interesting stuff before.
The article said 6.5 million uniques. The URL you gave claims 150k. I have always been confused by the various rankings but that seems a big difference.
http://siteanalytics.compete.com/dailybooth.com/
I just went back and looked at their application to figure out how we realized they were good. Their answers were very clear and concise; they obviously understood their users well. Plus they had both done interesting stuff before.