We evaluated the following tools:
Sprout Social, Webtrends, Pagelever. We did not, in fact, pick this system but went instead with PageLever.
We felt that Sprout was a good tool, but did not have the agency features we needed. In addition, the people we worked with a PageLever were incredibly helpful in helping us customize the system to meet our use case. The Sprout Social people we talked to were not unhelpful, but had more of a hands-off approach. For example, they sent us canned marketing materials, but didn't spend time with us to personally discuss our use case.